
The windows of the Yankee Grill, along with the rest of the windows on the first floor of the former Red Lion hotel complex, have been covered with OSB. Per Renton Code, within 30 days these materials are supposed to be replaced with glass or architectural materials that match the building. King County is currently leasing this former hotel/convention/restaurant complex.
I’ve been asked whether vacant buildings, like the former Red Lion and former Boeing office buildings on Park Avenue, are allowed to have windows indefinitely covered with untreated plywood or oriented strand board (OSB). The answer is no.
According to Renton Code, after 30 days the windows must be either properly repaired with glass, or covered with finished grade plywood that has been painted to architecturally match the building.
Here are the words from the Renton Municipal Code section regarding vacant buildings:
301.3.2.1 Architectural (cosmetic) structural panels: Architectural structural panels may be used to secure windows, doors, and other openings provided they are cut to fit the opening and match the characteristics of the building. Architectural panels may be of exterior grade finished plywood or Medium Density Overlaid plywood (MDO) that is painted to match the building exterior or covered with a reflective material such as plexi-glass.
Exception: Untreated plywood or similar structural panels may be used to secure windows, doors and other openings for a maximum period of thirty (30) days.

Owners of 535 Park Avenue, a former Boeing building, have been using unpainted OSB to secure the building. Renton Code requires the material be replaced with glass or painted architectural grade materials in 30 days.
Below the cut I’ve added further excerpts from the vacant building maintenance code.
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