This document provides an overview and introduction to environmental law for real estate development projects. It discusses the key federal and state environmental agencies, major environmental laws such as CERCLA, RCRA, the Clean Water Act, NEPA, and CEQA. It also covers how environmental issues typically arise in real estate development, including during due diligence, entitlements/development, and litigation. Due diligence involves Phase I and Phase II environmental site assessments to identify contamination issues and compliance with "all appropriate inquiry" rules to assert defenses to liability. Negotiation strategies with sellers, agencies, and insurers can help developers mitigate environmental risks.