Operating since 1997, Donald Pitman Design is a Southern California tenant improvement and commercial interiors studio at 3900 Fifth Avenue, Suite 290 in Hillcrest. The practice concentrates on commercial tenant facility improvements and common-area build-outs — lobbies, corridors, elevator banks, and shared amenity spaces — with City Construction Company running the construction phase on multi-tenant building scopes that require phased work around occupied neighboring suites during normal business hours. Drafting, space planning, and construction-document production run in-house for office landlords, retail owners, and multi-tenant building operators across the San Diego market. The commercial-interiors-first positioning contrasts with residentially focused design practices along the Fifth Avenue corridor — patrick cordelle studio, for instance — keeping the Pitman firm in the tenant-landlord service lane. Full-building common-area repositioning projects — where lobby, corridors, and multi-floor shared spaces all get reworked under a single coordinated design package — represent the studio's most comprehensive scope of work.