Due Diligence | Entitlements | Project Management | Construction Management | Contract Administration Successful land development begins with a strong knowledge of local conditions - including a region's physical, political, regulatory and economic factors. Sandbox's locally based staff enables our clients to benefit from our experience and familiarity with local zoning issues, plan development and review processes. Sandbox combines familiarity of the local regulatory environment with comprehensive consulting services in due diligence, entitlements, project management and construction management to create outstanding land development results.