223 Mesa Drive, offered together with the adjacent 215 Mesa Drive, is a rare luxury residential development opportunity in the heart of Eastside Costa Mesa, one of Orange County's most sought-after coastal communities. The project has secured conditional approval of a Vesting Tentative Parcel Map from the City of Costa Mesa for four detached homes on individually owned fee simple lots, delivering an approved development path forward. Together the two contiguous parcels total approximately 18,651 square feet (0.428 acres), zoned R2-MD. Upon completion, the site delivers four detached, two-story residences, each designed as a four-bedroom, four-and-a-half-bath home ranging from approximately 2,572 to 2,940 square feet, with contemporary architecture, open concept floor plans, private yards, and two-car garages. The sale includes a comprehensive Due Diligence Package with architectural plans, engineering, grading, landscape plans, surveys, subdivision documents, renderings, and entitlement materials, allowing a buyer to reduce upfront soft costs and entitlement risk and focus on carrying the project through to construction. Set on a quiet, tree-lined street minutes from Newport Beach, Fashion Island, South Coast Plaza, and John Wayne Airport, the property sits within a neighborhood anchored by top-rated schools and premier coastal amenities. With conditional approval secured, a full design package in hand, and a site plan reflecting 9.35 units per acre, this is a rare chance to acquire a well-located, near-ready coastal infill project in a supply-constrained market. This parcel is listed at $2,300,000 and must be sold together with the adjacent parcel (215 Mesa Drive) as a single transaction, for a combined purchase price of $4,600,000. The two parcels are offered concurrently and cannot be sold separately.