Uniform Commercial Code (UCC): Primary federal law governing commercial transactions, especially Article 2 for sale of goods. Each state has its own UCC adaptations.

Interstate Commerce Regulations: Federal regulations governing business transactions that cross state lines, including transportation and trade requirements.

Federal Antitrust Laws: Laws preventing monopolistic practices and promoting fair competition, including Sherman Act and Clayton Act.

FIRPTA: Foreign Investment in Real Property Tax Act - Applies when foreign parties are involved in US real estate transactions.

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

State Property Laws: State-specific regulations governing real and personal property transactions, including transfer requirements.

State Licensing Requirements: State-specific business and professional licensing requirements for parties involved in commercial transactions.

State Consumer Protection Laws: State-specific regulations protecting consumers and businesses from unfair practices and fraud.

Statute of Frauds: Legal requirement that certain contracts must be in writing to be enforceable, particularly relevant for property and high-value transactions.

Securities Laws: Federal and state regulations governing the sale of securities, if applicable to the transaction.

Environmental Regulations: Federal and state environmental protection requirements, particularly important in real property transactions.

Zoning Laws: Local ordinances and regulations governing property use and development.

Tax Laws: Federal, state, and local tax implications and requirements for commercial transactions.

Americans with Disabilities Act: Federal law requiring accessibility accommodations, particularly relevant for commercial property transactions.

Title Requirements: Regulations regarding title insurance, property recording, and handling of liens and encumbrances.