Fifth-generation construction management firm and general contractor at 888 Prospect St Suite 200, La Jolla, CA 92037, co-founded by Christian Costo, CCM (Certified Construction Manager through CMAA). The Costo family's building lineage traces to Costo Bros. Construction, founded in 1909 by Italian immigrant stonemasons who went on to build roads, bridges, and sections of the Alaska Highway during World War II. Today the company is run by a father-and-sons leadership team with 630+ completed residential, commercial, and civil projects since reincorporating in 2005. Certifications include CMAA Construction Management, ASQ Construction Quality Management, PMI Project Management, seismic structural design from Tokyo Tech, LEED V4 Building Design, and Hilti Advanced Firestop — a credential depth unmatched by other La Jolla contractors and reflecting the same institutional rigor found at Beacham Construction on Via Del Norte, which ranks in BuildZoom's top 5% with 68 permitted projects. Dual offices in La Jolla and Palm Desert. Services include pre-construction consulting, construction management, general contracting, owner representation, and post-project maintenance. 11–50 employees. Open Monday–Friday 8 AM–5 PM. For residential design-build remodels at a smaller scale, KAZA Design & Build on Prospect St handles projects from $10K–$500K.