The U.S. Post Office in Middleport New York is located at Main (state highways 31E and 271) and Church streets. It is a brick building erected in the late 1930s serving the 14105 ZIP Code which covers the village of Middleport and surrounding areas of the towns of Hartland and Royalton.It is one of only three in the state using that design a modernist form with Colonial Revival details. Inside is a mural commissioned by the Treasury Department. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Building