It's probably OK, but I'd ask whoever owns the building first. Some buildings are trademarked (particularly privately owned buildings). I have a shirt with an important building on it as part of the design; however, it's a public building and I know it's not trademarked.
In general just taking a picture of any building from public property in the US is OK, but if you publish it on a T-shirt I'd try to make sure there's no restrictions on using the image.
In general just taking a picture of any building from public property in the US is OK, but if you publish it on a T-shirt I'd try to make sure there's no restrictions on using the image.