Fair Housing Act: Federal law prohibiting discrimination in real estate transactions based on race, color, religion, sex, national origin, familial status, or disability

Truth in Lending Act (TILA): Federal regulation requiring disclosure of credit terms and financial agreements, particularly relevant if financing terms are modified in the addendum

Real Estate Settlement Procedures Act (RESPA): Federal law governing real estate settlement processes and prohibiting kickbacks and referral fees in real estate transactions

Interstate Land Sales Full Disclosure Act: Federal law requiring developers to provide detailed information about their development projects to potential buyers

Americans with Disabilities Act: Federal civil rights law protecting individuals with disabilities, which may affect property modifications or accessibility requirements

State Real Estate Laws: State-specific regulations governing real estate transactions, licensing, and property rights within the specific state jurisdiction

State Property Laws: Laws governing property rights, ownership, and transfer requirements specific to the state where the property is located

State Contract Laws: State-specific regulations governing contract formation, enforcement, and remedies

State Disclosure Requirements: State-mandated disclosures about property condition, hazards, and other material facts that must be provided to buyers

State Recording Requirements: Rules governing how real estate documents must be recorded with local government offices

Local Zoning Laws: Municipal or county regulations controlling property use, development, and modifications

HOA Rules: Homeowners Association regulations that may restrict or control property modifications and usage

Historic District Requirements: Special regulations governing properties in designated historic areas, including restrictions on modifications

Environmental Regulations: Federal, state, and local environmental protection laws affecting property use and development

Building Codes: Local and state construction and safety standards that must be met for any property modifications

Real Estate Commission Rules: State-specific regulations governing real estate professional conduct and transaction requirements

Standard Forms Requirements: State-approved or recommended forms and templates for real estate transactions

Professional Ethics Guidelines: Ethical standards and requirements for real estate professionals involved in the transaction