Pacifica Hotel in downtown San Diego's Gaslamp Quarter occupies a three-story brick building on Fourth Avenue constructed between 1910 and 1914, with 40 rooms stacked above street-level storefronts. The property runs as a single-room-occupancy format with a mix of private and shared bathrooms, putting a walk-up lodging option on the same Fourth Avenue restaurant corridor where Osteria Panevino serves its Gaslamp Quarter Italian menu. Family operated since 1972, the hotel retains a 5,000-square-foot basement framed by original redwood rafters and a steam-boiler footprint that dates to the building's first decade. Recent renovations updated lobby corridors and shared bath facilities while preserving the structure's multiple interior lightwells, which ventilate rooms without mechanical systems across three above-grade floors. The Gaslamp Quarter Historical Foundation lists 551 Fourth Avenue among the district's preserved early-twentieth-century commercial properties, and the hotel's budget-rate positioning draws convention visitors who prefer walkable proximity to the San Diego Convention Center over full-service amenities — and a post-session walk to Bangkok Day Spa for bodywork between convention days. Structural seismic testing ranks the 1910 brick shell among the safest buildings in the Gaslamp Quarter's 16.5-block historic district.