The Importance of Due Diligence in Quintana Roo Real Estate Transactions

A Jurisdiction Unlike Any Other

A single parcel on the Riviera Maya may simultaneously trigger constitutional restrictions on foreign ownership, federal environmental prohibitions, competing municipal and federal land use designations, Zona Federal Marítimo Terrestre (ZOFEMAT) concession requirements, unresolved ejidal origin complications, and pending administrative enforcement proceedings — none of which will appear in a standard notarial deed review. The investor who relies solely on a public deed and a registry certificate is not protected; they are exposed. What distinguishes a defensible acquisition from a stranded asset in Quintana Roo is the depth and integration of the due diligence process conducted before the transaction closes.

Registral Verification: Necessary but Structurally Insufficient

Every due diligence protocol begins with a full search of the Registro Público de la Propiedad (RPP). Under Articles 3042 through 3046 of the Federal Civil Code, and their counterparts in the Civil Code of the State of Quintana Roo, registration produces declaratory effects: it generates constructive notice, but it does not constitute the right itself. The First Chamber of the Supreme Court (Suprema Corte de Justicia de la Nación) has consistently held that unregistered real property rights remain valid between the parties and enforceable against those with actual knowledge, meaning a clean RPP search cannot exclude competing claims arising from unregistered possession, prior judicial adjudications not yet annotated, or rights originating in the agrarian system.

In Quintana Roo, this structural limitation is compounded by the legacy of ejidal conversions. Following the 1992 reforms to the Agrarian Law — particularly Articles 80 through 83, which govern the adoption of dominio pleno and conversion of ejidal parcels to private ownership — significant coastal tracts were regularized through the Agrarian Procuracy and subsequently transferred into private hands. Where that regularization process was initiated but never completed, private deeds may exist without a chain of title traceable to a valid agrarian resolution. Critically, under Article 83 of the Agrarian Law, a parcel for which the ejido assembly authorized dominio pleno but for which the National Agrarian Registry certificate was never formally issued and the parcel was never transferred out of the agrarian domain remains legally subject to ejidal ownership norms. Any purported private deed conveying such a parcel is void ab initio — not merely voidable — with the practical consequence that the buyer holds no transferable title and cannot cure the defect through prescription or registry annotation. This distinction between void and voidable title is operationally critical and must inform the scope of any agrarian chain of title review. A complete registral due diligence must therefore include a parallel search of the National Agrarian Registry (RAN) and, where applicable, an examination of the relevant ejido’s general assembly minutes and PROCEDE certification records. The RPP alone cannot substitute for this analysis.

Environmental Due Diligence: The Most Consequential Variable

Environmental risk is the most consequential and most frequently underestimated dimension of coastal due diligence in Quintana Roo. Under Article 28 of the General Law on Ecological Balance and Environmental Protection (LGEEPA), an Environmental Impact Manifestation (MIA) is required for real estate developments affecting coastal ecosystems, for changes of land use in forested areas or tropical forests (selvas), and for works in wetlands, mangroves, lagoons, rivers, and estuaries. Article 30 of the LGEEPA governs the mandatory content of MIAs, and Article 35 establishes the criteria SEMARNAT applies in granting, conditioning, or denying authorization.

Of particular significance for the Riviera Maya is Article 60 TER of the LGEEPA, incorporated by legislative reform on May 1, 2007. This provision categorically prohibits the removal, filling, transplanting, pruning, or any work or activity that affects the hydrological integrity of mangrove ecosystems and their zone of influence. The prohibition is absolute: no administrative authorization or environmental permit can override it. Federal courts have, with increasing consistency, upheld the broad application of Article 60 TER to developments purporting to rely on pre-existing permits, treating that argument as legally untenable where the actual vegetation was present at the time of the prohibited act, regardless of when the authorization was issued.

Complementary to the LGEEPA regime, NOM-022-SEMARNAT-2003 establishes technical specifications for the conservation and sustainable use of coastal wetlands (humedales costeros), and NOM-059-SEMARNAT-2010 governs species under a special protection regime whose documented presence on a parcel can trigger independent land use restrictions beyond those applicable under the general planning framework. A complete environmental audit requires physical inspection of the site, a review of SEMARNAT’s administrative file for all MIA proceedings associated with the parcel or its predecessors in title, and cross-referencing against the Programa de Ordenamiento Ecológico Territorial applicable to the relevant municipality.

Land Use and the POET: Navigating Federal-Municipal Conflicts

Land use regulation in Quintana Roo operates through a layered architecture that frequently generates internal conflict. At the federal level, the General Law on Human Settlements, Territorial Ordering and Urban Development (LGAHOTDU), published on November 28, 2016 — replacing the 1993 statute — distributes planning competences under Article 10 (federal attributions) and establishes minimum content requirements for municipal development programs under Article 27. Separately, Article 59 of the LGAHOTDU governs land use compatibility analysis at the level of specific urbanization actions and permits — a distinct obligation from the program-level content requirements of Article 27, and one that applies operationally at the point of reviewing individual development authorizations rather than at the stage of program formulation.

The operative instruments for coastal Quintana Roo are the Territorial Ecological Ordering Programs (POETs), which assign Environmental Management Units (UGAs) with specific permitted uses, intensity parameters, and required mitigation measures. A structural and recurring problem — and a significant source of litigation — is the normative conflict between UGA designations in a POET and the land use zones established in the applicable municipal urban development program. Where these instruments diverge, determining which prevails requires an analysis of constitutional competence under Article 73, fraction XXIX-G of the Constitution (which confers on the federal government concurrent environmental jurisdiction), the lex specialis and lex posterior principles, and frequently judicial intervention. As Raúl Brañes Ballesteros documented in his foundational work on Mexican environmental law, the fragmentation of environmental and planning competences across federal, state, and municipal levels generates precisely this type of normative overlap — a pathology the LGAHOTDU addressed only partially, and which Brañes correctly characterized as a symptom of incomplete federalism in territorial regulation.

ZOFEMAT: The Coastal Variable That Voids Titles

No element of Quintana Roo due diligence carries more potential for catastrophic, irreversible loss than the federal maritime-terrestrial zone. Under Articles 119 through 126 of the General Law of National Goods (LGBN), published in the Official Journal of the Federation on June 20, 2004, with subsequent amendments, the ZOFEMAT comprises a 20-meter strip of navigable land contiguous to the coastline, measured from the line of maximum ordinary high tide (pleamar máxima ordinaria). This strip is inalienable and imprescriptible federal public domain. No private deed, regardless of its formality or the status of its grantor, conveys title to land within the ZOFEMAT. The most a private party can hold is a concession granted by SEMARNAT — a concession that is time-limited under Article 126 of the LGBN, personal in nature, and subject to revocation for non-compliance with its conditions.

Federal courts have consistently held that occupation of the ZOFEMAT without a valid, current concession constitutes an unlawful appropriation of federal goods subject to administrative enforcement under the LGBN and potential criminal liability under the Federal Penal Code, irrespective of any private deed or RPP inscription. The First Chamber of the SCJN has affirmed that the federal public domain character of the ZOFEMAT is a matter of public order not susceptible of waiver or private agreement. Due diligence verification must therefore address: the precise physical boundaries of the ZOFEMAT as determined by SEMARNAT’s official delimitation studies; whether any portion of the parcel falls within the zone; and whether any existing concession is valid, current, and transferable.

On the question of transferability, practitioners must engage directly with the legal standard governing it. Under Article 126 of the LGBN, ZOFEMAT concessions are personal in nature — intuitu personae — and are not freely assignable as a matter of law. Any transfer of a concession requires express authorization from SEMARNAT, and that authorization is subject to conditions that are frequently not met in practice. In the absence of such authorization, the concession is presumptively non-transferable, and a transaction structured on the assumption that the existing concession will carry over to the buyer without SEMARNAT approval is legally deficient. Due diligence must therefore review the specific concession instrument for any assignment clause, assess SEMARNAT’s administrative position on the proposed transfer, and evaluate whether the conditions for authorized assignment can realistically be satisfied within the transaction timeline. The absence of a unified coastal cadastre integrating ZOFEMAT boundaries with private registry data — a critical institutional deficiency discussed below — makes this verification technically demanding and, absent proper legal counsel, systematically neglected.

Pending Litigation and Hidden Administrative Proceedings

Mexican law imposes no statutory disclosure obligation on property sellers with respect to pending litigation or administrative proceedings affecting the property. This stands in marked contrast to the disclosure frameworks operative in other jurisdictions. In Florida, the general obligation to disclose material facts affecting a property derives from the common law duty recognized by the Florida Supreme Court in Johnson v. Davis, 480 So.2d 625 (Fla. 1985), and from the broader statutory scheme of which §689.261 of the Florida Statutes forms one component. Section 689.261 itself specifically mandates disclosure of flood zone status and the availability of flood insurance; it does not establish the general material-facts disclosure obligation, which remains grounded in the Johnson v. Davis common law framework and its companion statutory provisions. These are distinct legal sources with distinct operative scopes, and conflating them understates the doctrinal complexity of Florida’s seller disclosure regime.

In the Mexican framework, precautionary measures (medidas cautelares) issued by courts are not uniformly or timely annotated in the RPP, meaning a buyer may acquire property that is already the subject of active litigation without any registral indication of that fact. A complete litigation due diligence must therefore encompass proactive searches across multiple registries: the Poder Judicial de la Federación’s SEMANOT platform for federal proceedings, including amparo and administrative contentious cases; the Tribunal Superior de Justicia del Estado de Quintana Roo for local civil, commercial, and agrarian proceedings; and administrative registries maintained by SEMARNAT, PROFEPA, the Secretaría de Desarrollo Agrario, Territorial y Urbano (SEDATU), and relevant municipal planning authorities for enforcement actions, inspection orders, and closure proceedings. The transaction counsel’s role here is not merely to search existing annotations — it is to reconstruct the full regulatory and judicial history of the parcel through direct administrative access requests under the Ley General de Transparencia y Acceso a la Información Pública.

Foreign Ownership: The Constitutional and Statutory Framework

For international investors — a predominant client profile in Quintana Roo — the constitutional and statutory architecture of acquisition requires separate verification. Article 27, Section I of the Constitución Política de los Estados Unidos Mexicanos prohibits foreigners from directly acquiring ownership of real estate within the zona restringida: a strip of 100 kilometers from international borders and 50 kilometers from the coastline. The entire Riviera Maya corridor falls within this restriction.

The operative mechanism for foreign residential acquisition in the restricted zone is governed by Articles 10, 11, and 13 Bis of the Ley de Inversión Extranjera (LIE), in conjunction with the applicable provisions of the Reglamento de la Ley de Inversión Extranjera. Article 11 addresses the restricted zone permission for residential real estate acquisition through a fideicomiso with a Mexican credit institution as trustee. However, the fideicomiso structure itself and, critically, the notification obligation to the Secretaría de Relaciones Exteriores (SRE) are governed by Article 13 Bis of the LIE and the Reglamento — not by Article 11 alone. Citing only Article 11 risks causing a practitioner to miss the full compliance chain: Article 13 Bis and the Reglamento establish the procedural requirements, notification timelines, and documentary obligations that complete the statutory scheme and give the fideicomiso its legally operative form. A due diligence protocol for foreign buyers must verify compliance across this entire framework, as any direct acquisition in the restricted zone — outside the fideicomiso mechanism or applicable corporate structures for non-residential purposes — is constitutionally void.

Para fines no residenciales — desarrollo hotelero, bienes raíces comerciales, instalaciones industriales — pueden utilizarse vehículos corporativos mexicanos con estructuración de inversión extranjera aplicable, sujetos a las restricciones sectoriales de la LIE. La cadena completa de cumplimiento conforme a los artículos 10, 11 y 13 Bis, junto con el Reglamento, debe evaluarse frente al propósito específico y la estructura de cada adquisición.

Perspectivas Comparativas: Florida y España

Una comparación con Florida y España revela tanto la sofisticación alcanzable en marcos legales de bienes raíces costeros como las brechas estructurales que actualmente caracterizan al sistema mexicano. En Florida, el seguro de título — estándar para cualquier adquisición financiada institucionalmente — proporciona un respaldo transaccional contra defectos de título que la ley mexicana no ofrece. Las Evaluaciones de Sitio Ambiental Fase I y Fase II realizadas conforme a los estándares ASTM E1527-21 proporcionan certificación ambiental independiente como práctica transaccional estándar. La Línea de Control de Construcción Costera establecida conforme a §161.053 de los Estatutos de Florida crea un amortiguador costero mapeado públicamente y mantenido administrativamente, análogo pero administrado más precisamente que la ZOFEMAT: sus límites se integran con los registros de propiedad del condado y son públicamente buscables, eliminando la ambigüedad catastral endémica al marco costero mexicano.

El marco de divulgación de vendedores de Florida opera en dos niveles legales distintos que no deben confundirse. El deber general de revelar hechos materiales que afecten el valor de una propiedad deriva de la sentencia de la Corte Suprema de Florida en Johnson v. Davis, 480 So.2d 625 (Fla. 1985), que estableció una obligación de derecho común fundamentada en la prevención del ocultamiento fraudulento. La Sección 689.261 de los Estatutos de Florida funciona como un complemento estatutario más específico: ordena que los vendedores revelen el estado de la zona de inundación y la disponibilidad de seguros contra inundaciones, abordando una categoría definida de riesgo ambiental y financiero distinta de la obligación más amplia de divulgar hechos materiales. Estas dos fuentes — derecho común y estatuto específico — son complementarias pero independientes, y comprender sus respectivos alcances es esencial para caracterizar con precisión el régimen de divulgación de Florida en un contexto comparativo.

En España, la nota simple del Registro de la Propiedad, autorizada conforme al Artículo 222 de la Ley Hipotecaria, proporciona un resumen jurídicamente confiable de propiedad, gravámenes, cargas y anotaciones procedimentales en un único documento certificado. La Ley de Costas española (Ley 22/1988, sustancialmente modificada por la Ley 2/2013) establece dominio público marítimo-terrestre con una servidumbre de protección de 20 metros y una zona de influencia de 100 metros — un amortiguador costero más extenso que la ZOFEMAT mexicana, y cuya aplicación retroactiva generó litigio constitucional significativo ante el Tribunal Constitucional en términos comparables a los procedimientos de amparo en México. La lección compartida de ambas jurisdicciones es que la protección del inversionista en bienes raíces costeros requiere la integración de verificación de título, certificación ambiental y mapeo de límites costeros en un instrumento jurídicamente confiable y centralmente accesible. México aún no ha desarrollado un marco equivalente, colocando la carga completa de la debida diligencia integrada en los asesores legales de las partes.

Brechas Legales Críticas y Riesgos Estructurales

Varias deficiencias institucionales en el marco regulatorio de Quintana Roo demandan reconocimiento directo. Primero, la ausencia de un catastro costero integral que integre los límites de ZOFEMAT con datos del RPP y del catastro municipal crea discrepancias sistemáticas entre escrituras privadas y límites de zona federal que ninguna búsqueda única de registro puede resolver. Segundo, el conflicto POET-plan municipal — que Raúl Brañes Ballesteros ha identificado correctamente como síntoma de federalismo incompleto en la regulación territorial, surgido de la fragmentación estructural de competencias ambientales y de planificación a través de niveles federal, estatal y municipal — significa que un inversionista puede poseer un certificado válido de uso de suelo municipal y aún así estar en violación de una designación ecológica federal con fuerza legal superior. Tercero, los registros administrativos de SEMARNAT para autorizaciones de MIA y concesiones de ZOFEMAT no son centralmente accesibles en un formato que permita referencias cruzadas confiables con datos catastrales, requiriendo solicitudes de acceso administrativo caso por caso que agregan tiempo e incertidumbre a cualquier transacción. Cuarto, y como Rafael Rojina Villegas estableció en su análisis del sistema registral mexicano, la certeza legal del registro es solo tan confiable como la completitud de sus datos de entrada: un sistema de registro que omite orígenes agrarios, traslapes de ZOFEMAT y medidas precautorias no anotadas es estructuralmente incompleto precisamente en las dimensiones que más importan a un inversionista costero. Separadamente, la erudición de Bernardo Pérez Fernández del Castillo sobre forma notarial y estructura transaccional en la ley de propiedad mexicana subraya que la validez contractual y el cumplimiento administrativo son jurídicamente interdependientes — una escritura limpia ejecutada ante notario público no sanitiza una adquisición subyacente que no satisface las condiciones constitucionales o regulatorias que la rigen.

These are not anomalous risks to be managed by negotiating favorable representations and warranties. They are systemic features of the regulatory landscape that require proactive legal mapping before any transaction proceeds.

A Structured Due Diligence Protocol for Quintana Roo

Given the foregoing, a rigorous due diligence protocol for Quintana Roo real estate must encompass, at minimum: a full RPP chain of title search traceable to the original grant or agrarian origin; parallel RAN verification for parcels with ejidal history, including confirmation that any dominio pleno conversion was completed by formal issuance of the RAN certificate so as to avoid the void-title consequence under Article 83 of the Ley Agraria; physical and administrative ZOFEMAT delimitation analysis against SEMARNAT records, including review of any existing concession instrument for transferability under Article 126 LGBN and assessment of SEMARNAT’s administrative position on any proposed assignment; review of all applicable POET UGA designations and municipal development programs, with a normative conflict analysis where they diverge, applying the distinction between Article 27 program-content requirements and Article 59 compatibility obligations under the LGAHOTDU; verification of MIA authorizations and their conditions, including NOM-022 and NOM-059 compliance; mangrove presence assessment and the corresponding analysis under Article 60 TER of the LGEEPA; multi-registry litigation and administrative proceeding searches at federal, state, and municipal levels; and, for foreign buyers, a structural compliance review under Article 27 of the CPEUM and Articles 10, 11, and 13 Bis of the LIE together with the Reglamento, with particular attention to the SRE notification obligations arising under Article 13 Bis. This is not a checklist to be delegated to a single notarial appointment. It is a multi-disciplinary legal analysis that, when executed properly, converts an opaque acquisition into a defensible investment.

IBG Legal brings to Quintana Roo property acquisitions an established methodology for ZOFEMAT boundary reconciliation against RPP and municipal cadastral data — integrating SEMARNAT’s official delimitation records with private registry information to identify and resolve the discrepancies that standard registry searches systematically miss — and a multi-registry administrative access protocol designed to surface unannotated enforcement proceedings, MIA conditions, and ZOFEMAT concession histories across federal, state, and municipal levels before a transaction closes. That integrated capability, developed through contentious and transactional mandates across the Riviera Maya corridor, is what distinguishes a defensible acquisition from a stranded asset in this jurisdiction. IBG Legal is headquartered in Cancún with offices in Mexico City and Querétaro. For specialized advice on Quintana Roo property acquisitions, contact us.

Sources and References

Legislation

• Political Constitution of the United Mexican States, Article 4 (right to a healthy environment, as amended June 2011); Article 27, Section I (restricted zone and foreign ownership prohibition); Article 73, Section XXIX-G (concurrent environmental jurisdiction).
• Federal Civil Code, Articles 3042–3046 (Registro Público de la Propiedad: registration effects and obligations).
• Civil Code of the State of Quintana Roo, registry provisions applicable to the state RPP.
• General Law on Ecological Balance and Environmental Protection (LGEEPA), DOF January 28, 1988, with amendments to date: Articles 28 (MIA-triggering activities), 30 (MIA content), 35 (authorization criteria), 60 TER (absolute mangrove protection, incorporated May 1, 2007).
• Regulations of the LGEEPA on Environmental Impact Assessment, DOF May 30, 2000, with amendments.
• NOM-022-SEMARNAT-2003: Specifications for the conservation, sustainable use, and restoration of coastal wetlands.
• NOM-059-SEMARNAT-2010: Environmental protection — native Mexican species of wild flora and fauna — risk categories and specifications for their inclusion, exclusion, or change.
• General Law on National Assets (LGBN), DOF June 20, 2004, with amendments: Articles 119–126 (ZOFEMAT: definition, delimitation, concession regime, time limits, personal nature of concessions, transferability conditions, and revocation); Article 126 (governing the intuitu personae character of ZOFEMAT concessions and the requirement of express SEMARNAT authorization for any transfer or assignment).
• General Law on Human Settlements, Territorial Planning and Urban Development (LGAHOTDU), DOF November 28, 2016: Article 10 (federal attributions); Article 27 (minimum content requirements for municipal development programs); Article 59 (land use compatibility analysis obligations applicable at the level of specific urbanization actions and permits, distinct from the program-level content requirements of Article 27).
• Foreign Investment Law (LIE), DOF December 27, 1993, with amendments: Articles 10, 11, and 13 Bis (foreign acquisition in the restricted zone; fideicomiso mechanism; SRE notification obligation governed by Article 13 Bis and the Reglamento de la LIE, not by Article 11 alone).
• Regulations of the Foreign Investment Law: applicable provisions governing fideicomiso structure, notification procedures, and compliance obligations in conjunction with LIE Articles 10, 11, and 13 Bis.
• Agrarian Law, DOF February 26, 1992: Articles 80–83 (dominio pleno and ejidal parcel conversion to private ownership); Article 83 specifically (legal consequence that a parcel for which the RAN certificate of dominio pleno was never formally issued remains subject to ejidal ownership, rendering any purported private deed void ab initio).
• General Law on Transparency and Access to Public Information, DOF May 4, 2015, as amended.
• Law on Urban Development of the State of Quintana Roo, with applicable municipal urban development programs (Programas de Desarrollo Urbano) for Benito Juárez, Solidaridad, Tulum, and other municipalities in the Riviera Maya corridor.
• Territorial Ecological Planning Program for the Cancún–Tulum Corridor and other applicable POETs, published by SEMARNAT.

Case Law and Judicial Criteria

• First Chamber of the SCJN: consistent criteria on the declaratory (non-constitutive) effects of registration in the RPP under Mexican civil law, and on the enforceability of unregistered real property rights between parties with actual knowledge.
• First Chamber of the SCJN: criteria on the public order and non-waivable nature of Article 27, Section I of the CPEUM with respect to the restricted zone — any direct acquisition by a foreigner in violation of this provision is constitutionally void regardless of the instrument’s notarial formality.
• Federal collegiate courts: criteria affirming the absolute character of the prohibition under Article 60 TER of the LGEEPA and rejecting the argument that pre-existing permits immunize developments from the mangrove protection regime where the vegetation was present at the time of the prohibited act.
• Federal courts (multiple circuits): consistent holding that occupation of ZOFEMAT without a valid, current SEMARNAT concession constitutes unlawful appropriation of federal goods subject to administrative enforcement and criminal liability, regardless of any private deed or RPP registration.
• SCJN (Pleno): environmental rights jurisprudence developed following the June 2011 constitutional reform to Article 4, applying a pro persona interpretive standard and invoking, in the reasoning of certain amparo proceedings challenging environmental impact authorizations, a principle analogous to the international law doctrine of in dubio pro natura (deriving from Principle 15 of the Rio Declaration on Environment and Development). It should be noted that this standard has been reflected in SCJN reasoning and invoked in federal environmental amparo proceedings post-2011, but has not yet crystallized as a formally binding tesis jurisprudencial of the Pleno with that specific denomination under Mexican law. Its operative weight is therefore case-specific and subject to ongoing doctrinal development; practitioners should assess its applicability on a proceeding-by-proceeding basis rather than treating it as settled binding doctrine.
• Johnson v. Davis, 480 So.2d 625 (Fla. 1985): Florida Supreme Court decision establishing the common law duty of sellers to disclose material facts affecting real property value, forming the doctrinal foundation of Florida’s general seller disclosure obligation, distinct from the specific statutory disclosure requirements of §689.261 of the Florida Statutes.

Doctrine

• Rojina Villegas, Rafael. Compendium of Civil Law, Volume II: Property, Real Rights and Succession. Porrúa, Mexico City. Multiple editions. [On the declaratory character of registration and the structural limits of the RPP.]
• Brañes Ballesteros, Raúl. Manual of Mexican Environmental Law. 2nd ed. Fondo de Cultura Económica / Fundación Mexicana para la Educación Ambiental, Mexico City, 2000. [On the fragmentation of environmental competences and normative conflicts between federal and municipal planning instruments; on the characterization of POET-municipal plan conflict as a symptom of incomplete federalism in territorial regulation.]
• Pérez Fernández del Castillo, Bernardo. Civil Contracts. Porrúa, Mexico City. Multiple editions. [On the notarial form, real estate transaction structure, and the relationship between contractual validity and administrative compliance in Mexican property law.]
• Gutiérrez y González, Ernesto. Patrimony. Porrúa, Mexico City. [On the distinction between public domain goods and private property, and the legal consequences of ZOFEMAT classification.]

Comparative Legislation

• Florida Statutes §161.053 (Coastal Construction Control Line).
• Florida Statutes §689.261 (mandatory seller disclosure of flood zone status and availability of flood insurance; to be distinguished from the general material-facts disclosure obligation established under Florida common law by Johnson v. Davis, 480 So.2d 625 (Fla. 1985), and the broader statutory disclosure scheme of which §689.261 forms one specific component).
• ASTM E1527-21: Standard Practice for Environmental Site Assessments — Phase I Environmental Site Assessment Process.
• Spain: Coastal Law, Law 22/1988, as amended by Law 2/2013 (maritime-terrestrial public domain, coastal servitudes, and retroactive application).
• Spain: Mortgage Law, Article 222 (nota simple informativa from the Registro de la Propiedad).
• Rio Declaration on Environment and Development, Principle 15 (precautionary approach; doctrinal source of the in dubio pro natura standard invoked in post-2011 Mexican federal environmental amparo proceedings).

Official and Administrative Sources

• SEMARNAT: ZOFEMAT delimitation records and concession registry (including concession instruments governing transferability under Article 126 LGBN); MIA authorization database (SINAT — Sistema Nacional de Trámites Ambientales).
• Registro Agrario Nacional (RAN): ejidal parcel certification records and dominio pleno conversion files, including verification of formal RAN certificate issuance under Article 83 of the Ley Agraria.
• Registro Público de la Propiedad y del Comercio del Estado de Quintana Roo.
• Secretaría de Relaciones Exteriores (SRE): trust notification and authorization registry for restricted zone acquisitions, pursuant to Article 13 Bis of the LIE and the Reglamento de la Ley de Inversión Extranjera.
• Poder Judicial de la Federación — SEMANOT: federal judicial proceedings registry.