Loyalty Building, National Register of Historic Places site in Portland, Oregon.

The Loyalty Building is a historic commercial building in downtown Portland, Oregon, listed on the National Register of Historic Places. It was formerly known as the Buyers Building and the Guardian Building. The structure was designed by the firm Claussen and Claussen.

The structure was designed during Portland's period of commercial growth when new business buildings shaped the downtown. Its construction reflected the city's expanding economy and architectural ambitions of that time.

The building reflects construction preferences of early business owners who valued visible craftsmanship in commercial districts. Its design shows how architectural choices communicated trustworthiness to customers and business partners of that era.

The building sits in Portland's business district and is easy to locate in the downtown area. Visitors should be aware that active office operations may limit access to interior spaces during regular business hours.

The name comes from the Loyalty Life Insurance Company, which bought the building in 1945 and renamed it. Before that it was the Guardian Building, after Guardian Life Insurance, and originally the Buyers Building for the Pacific Coast Buyers Association. The building is also credited to Claussen and Claussen.