When developers convert existing buildings from office or retail to residential use, they frequently encounter a costly surprise: parking requirements that exceed what the original structure was built to provide. Municipal codes typically demand more parking for residential conversions than for the commercial uses they replace, leaving developers with a shortfall that can threaten project viability. This issue is particularly acute in built-out downtowns where land for expansion is scarce or nonexistent.
A recent multifamily conversion in downtown Walnut Creek, California, illustrates the challenge and a potential solution. Located in the city’s Golden Triangle district, the building already had a dedicated parking garage, but it wasn’t sized for the higher space count required by the new residential use. With no adjacent land available, the developer faced a choice: demolish the existing garage and rebuild underground—an expensive and disruptive option—or find a way to add capacity within the existing walls. They chose the latter, working with Christopher Tiessen, President/CEO of KLAUS Multiparking America, to install MultiBase 2072i automated parking systems. The design set one parking level into a pit and stacked a second above it, effectively adding a full tier of spaces without excavating for an entirely new underground level.
According to Tiessen, the key to avoiding such shortfalls is early evaluation. “The developers who see the greatest opportunities are those who evaluate the parking strategy early,” he says. “Running the parking numbers before acquiring a property can reveal opportunities to maximize space, improve project economics, and make more informed investment decisions.” He notes that the mismatch between old and new requirements is easy to underestimate during the offer stage. “Office and retail uses tend to carry lighter parking requirements than residential does in most jurisdictions,” Tiessen explains. “So a use change can hand a developer a shortfall they weren’t budgeting for, on a site that has nowhere left to grow.”
What distinguishes successful adaptive reuse projects, in Tiessen’s view, is whether the existing garage is treated as an asset or a liability. “Tearing out a structure and rebuilding underground is the most expensive and most disruptive way to close a parking gap,” he says. “Every level you can recover inside what’s already there is a level you don’t have to excavate, finance, or explain to a lender.” This approach not only saves money but also reduces construction time and neighborhood disruption, making it an attractive option for developers navigating tight urban sites.
As more office and retail buildings convert to residential use in built-out downtowns across the country, the Walnut Creek project serves as a model for addressing parking shortfalls creatively. By leveraging automated systems that fit within existing structures, developers can unlock additional capacity, improve project economics, and avoid the pitfalls of demolishing and rebuilding. The implications are significant: as cities encourage adaptive reuse to meet housing demand, understanding and planning for parking requirements early can mean the difference between a viable project and a stalled one. For developers, the lesson is clear: evaluate parking strategies before acquisition, and consider innovative technologies that maximize existing space rather than defaulting to costly excavation. This proactive approach can turn a potential deal-breaker into a manageable challenge, enabling more conversions that revitalize downtowns and add much-needed housing.
