A pair of empty office buildings near Costco’s Issaquah headquarters could soon get a very different second act: 262 apartments instead of corporate workspaces. The proposal would turn a former Microsoft campus into one of the city’s biggest office-to-housing conversions yet.
The concept was detailed by Puget Sound Business Journal, which reported that the vacant buildings are being targeted for residential reuse. Issaquah planning documents identify the proposal as Vintage at Parq, and the report says it could bring hundreds of affordable units, although the final affordability mix and financing plan have not been publicly outlined.
The project remains early-stage rather than shovel-ready. The city’s Q1 2026 development report says a pre-application meeting was held in November 2025 for converting the two existing office buildings into residential apartments, with amenity spaces distributed throughout the five- and six-story structures.
From Microsoft Offices To Apartment Buildings
The two buildings are part of The ParQ, an office campus with roughly 411,000 square feet across its two remaining structures. The property’s official leasing site lists Building 1 at 21925 SE 51st Street and Building 2 at 21933 SE 51st Street, both of which are currently marketed as available office space.
That scale is part of what makes the proposal notable. Converting the buildings would require reworking office floor plates, plumbing, utilities, layouts and life-safety systems, but it could also put hundreds of homes on a site that already has roads, parking and access to nearby jobs, shopping and trails.
Issaquah Has Incentives Aimed At This Kind Of Housing
Issaquah has been building a policy lane for larger residential projects in Central Issaquah. The city’s Pioneer Program is designed for developments with 100 to 400 units and allows developers to choose between reserving 8% of units for households at 60% of area median income or 10% for households at 80% of area median income, along with possible tax exemptions.
It is not clear from the public materials reviewed whether Vintage at Parq would use that program. But the timing fits a broader local push to place more housing near employment centers, especially as suburban office properties struggle to attract the kind of large corporate tenants they once relied on.
Another Issaquah Property Is Already Getting A Housing Reboot
The proposed conversion would join a growing list of Issaquah reuse projects. Hoodline reported in January that a Motel 6 near Costco is slated to become 103 workforce studios, while a separate former Costco office building nearby is being demolished for a 74-unit townhouse project, according to the Seattle Daily Journal of Commerce.
For now, Vintage at Parq is still a proposal that must move through the city’s land-use and permitting process. If it advances, Issaquah would be swapping a large vacant office footprint for housing in a location originally built to serve the region’s corporate economy.
