Act as a senior architect conducting a site analysis. Analyze the following site conditions and develop a preliminary building program:
Site: [LOCATION, SIZE, CONTEXT]
Project type: [RESIDENTIAL/COMMERCIAL/MIXED-USE]
Client brief: [DESCRIBE NEEDS]
Provide: 1) Site opportunities and constraints analysis, 2) Zoning and setback implications, 3) Recommended spatial program with square footages, 4) Three conceptual massing strategies with pros/cons, 5) Key design drivers to guide the next phase. Format as a professional design brief.