Welcome to 4437 Phelan Avenue - a rare residential development opportunity in the heart of Baldwin Park, CA. Two lots are currently available for individual sale, each thoughtfully designed to maximize livability, income flexibility, and long-term investment value, with three fully equipped residential units on an approximately 5,900 sq. ft. parcel. Each parcel features a modern all-electric primary residence of approximately 1,752 sq. ft. with three bedrooms - each with a private ensuite bath - plus a dedicated laundry area, an attached two-car garage (approx. 433 sq. ft.), full appliance package, solar panels, and a future-ready wall battery connection port. Attached to each main home is a Jr. ADU studio of approximately 256 sq. ft. with one bathroom, mini-split HVAC, in-unit combo washer/dryer, mini refrigerator, and cooktop - ideal for guests, caregivers, or supplemental rental income (utilities shared with primary). Each parcel also includes a fully independent detached ADU of approximately 781 sq. ft., featuring 2 bedrooms plus an office, one bathroom, in-unit stackable washer/dryer, dedicated solar, central heat and AC, a full appliance package, and separate water and electric meters - maximizing tenant privacy and rental flexibility. Set against the San Gabriel Mountain backdrop, this established Baldwin Park community enjoys proximity to major freeway corridors connecting residents to Downtown Los Angeles, the Inland Empire, and key employment centers throughout Southern California. Nearby parks, schools, dining, and everyday retail ensure a convenient, connected lifestyle. Whether you're an owner-occupant seeking multi-generational living, an investor building a rental portfolio, or a developer seeking a turn-key income property - this offering delivers on all fronts. Parcels available individually or as a complete two-parcel portfolio.