An engineering consultancy operating from a Voltaire St address in OB, Martin & McMillen LLC provides engineering consulting services in a neighborhood where coastal construction constraints drive unusual structural and site-design problems. Salt-air corrosion, bluff proximity, and century-old Craftsman building stock drive the structural and site-design issues the consultancy fields most often — the same post-permit engineering questions that design-build remodelers including CairnsCraft Design & Remodel send upstream during OB renovation work. The small-firm engineering consulting format is common in coastal San Diego, where single-project structural review, foundation assessment, and compliance consultation fill a gap between large multidisciplinary firms and solo-licensed engineers. Typical consulting engagements involve document review, a site visit, and a written opinion letter rather than full design-of-record services. Owner-occupants assessing older homes, small general contractors needing a second opinion on a structural detail, and investors acquiring OB and Sunset Cliffs property through agents including AJ George Commercial & Resimercial Real Estate make up the typical client roster for this scale of practice. The most complex engagements are coastal residential structural-review assignments where a 1920s beach cottage on Sunset Cliffs-adjacent terrain is being assessed for the feasibility of a second-story addition or a significant foundation retrofit.