Charles Q. Clapp Block, Portland

The Hay Building, also known as Charles Q. Clapp Building, is a historic commercial building in downtown Portland. It was built in 1826 by architect Charles Q. Clapp and is one of the city's oldest commercial buildings. The building is part of a block of three buildings at Congress Square, occupying a triangular site at the junction of Congress, High, and Free Streets.

The main building is three stories high, made of beige-painted brick with dark green trim. The lower floors have arched windows, and the third floor was added later with five windows and a projecting cornice. The second building, northeast of the first, is also three stories but shorter in height. It has square windows on the upper levels and a picture window with an entrance on the first level. The third building is 2-1/2 stories tall, with three bays, a recessed doorway, and a low balustrade on the second floor.

The main block, designed by Charles Quincy Clapp, showcases a Federal-style design. It gained its popular name, the Hay Building when Hay's Pharmacy occupied the ground floor starting in 1841. The third level was added in 1922 by John Calvin Stevens. The building was listed on the National Register of Historic Places on January 31, 1978.