DesignX Architecture + Interiors is a boutique commercial design studio on La Mesa Boulevard in La Mesa Village, specializing in restaurant, bar, office, and hotel interiors with integrated FF&E procurement and brand identity development. The firm's Whissel Realty project transformed a historic barrel-vaulted mid-century building on La Mesa's main corridor into a modern brokerage featuring walnut wood paneling, a soundproof podcast room, and an outdoor courtyard carved from the existing roof structure, with electrical and lighting installations coordinated through contractors like Balboa Electric for period-specific fixture wiring. Custom furniture fabrication is part of the studio's vertical integration, producing built-in banquettes, reception desks, and conference tables designed in-house and manufactured to spec. Post-construction commercial handoffs typically involve deep-clean coordination with firms such as Commercial Cleaning San Diego - Cavalry Cleaning to prepare finished spaces for occupancy and final photography. The most complex hospitality buildouts involve full kitchen exhaust hood design, Type I and Type II ventilation calculations, and health department plan-check submissions alongside the architectural construction document package.