A mixed-use hospitality development would bring new guest rooms, ground-floor retail, and a pedestrian passageway to a 0.71-acre assemblage in the heart of the Gaslamp Quarter Historic District
A proposal to construct a 12-story, 240-room hotel at 345 4th Ave. in San Diego’s Gaslamp Quarter would introduce a significant new hospitality development to the downtown historic district. The project targets a roughly 0.71-acre assemblage of parcels situated between J Street and K Street, spanning frontages along both 4th Avenue and 5th Avenue, as reported by LAYIMBY. City records cite RGC 4J, LLC, an Encinitas-based entity, as the project applicant.
The development would rise approximately 125 feet and deliver a mixed-use program anchored by the hotel rooms and complemented by retail and restaurant space along the ground and second floors. Plans also include a hotel bar and restaurant at the corner of 4th Avenue and J Street, meeting and event space, a spa and fitness center, and a rooftop pool with an outdoor food and beverage lounge. The project remains in the entitlement and environmental review phase. A public hearing date has not yet been announced.
A central element of the proposal involves the Whitney Building at 343 4th Ave., a recognized historic resource within the Gaslamp Quarter Historic District. While several existing commercial structures on the assembled site would be demolished, the Whitney Building façade would be retained, stabilized, and incorporated into the design of the new hotel in roughly its current position. The approach reflects the regulatory framework governing the Gaslamp Quarter Planned District, where alterations to contributing historic structures require discretionary review and permitting from the city.
According to a City of San Diego notice of application, the project site encompasses approximately 31,077 square feet at the southeast corner of 4th Avenue and J Street, and the proposal requires a Site Development Permit for the substantial alteration of the Whitney Building, a Neighborhood Development Permit for deviations from development regulations, and a Neighborhood Use Permit for sidewalk café space and outdoor use areas. The development would also create a pedestrian passage connecting 4th Avenue and 5th Avenue through the interior of the block, providing a publicly accessible walkway for hotel guests and Gaslamp visitors moving between the two streets.
The proposal arrives as San Diego’s hotel market continues to draw development interest despite elevated construction costs and regulatory headwinds constraining new supply statewide. San Diego County saw five hotels accounting for 2,034 rooms open in 2025, driven largely by the debut of the 1,600-room Gaylord Pacific Resort in Chula Vista, according to a January 2026 Atlas Hospitality Group year-end report. At the same time, development activity slowed slightly, with 12 hotels under construction in the county last year compared with 13 in 2024. The broader pipeline, however, remains active. According to a Lodging Econometrics construction pipeline trend report, San Diego has 37 projects totaling 8,716 rooms in various stages of development, including 12 projects with 1,861 rooms presently under construction. The central business district accounts for the largest share of that pipeline, with 15 projects totaling 4,294 rooms concentrated in the San Diego CBD.
The proposed 4th and J Hotel would join a Gaslamp Quarter submarket that has seen several recent hospitality additions, including the 135-room Sentral Gaslamp Quarter, which opened in 2025 with a hybrid furnished-apartment and hotel model, and the 96-key Granger Hotel Gaslamp Quarter, a Design Hotels property that debuted in late 2024 within a restored 1904 building. The Gaslamp Quarter’s status as one of downtown San Diego’s most prominent pedestrian-oriented districts, combined with its proximity to the San Diego Convention Center, positions new hospitality developments to benefit from the area’s concentrated visitor traffic. The proposed project’s inclusion of ground-floor retail and restaurant components, along with the through-block pedestrian connection, would contribute to the district’s street-level commercial activity.
Generally, San Diego’s hotel performance metrics have moderated heading into 2026. Twelve-month occupancy held above 70 percent through December 2025, finishing at 72.3 percent, though RevPAR declined 0.9 percent for the trailing 12 months through October, reflecting softer summer demand and reduced government-related travel, according to a January 2026 hotel market forecast published by R.A. Rauch & Associates. The forecast calls for modest improvement this year, with RevPAR growth of approximately 1.5 percent in 2026 driven by roughly 2 percent supply growth, 2 percent demand growth, and 1.5 percent average daily rate growth.
