There is a difference between public use buildings like those mentioned, and publically owned buildings. According to the ASMP, a release is not needed for advertising use in the case of publically owned buildings. However, permission, and or permits may be necessary to gain access.
Public use buildings like hotels, malls, etc, are privately owned and you are best served to ask permission beforehand, as they call all the shots here. As mentioned, releases are required for any advertising use of privately owned properties.
Becareful of airports. Post 911, lots of things have come under scrutiny about photographing in and around strategic structures. Even local law enforcement has trouble interpreting these things. IE, you may be right, but if it costs you attorneys fees and bail to get you out, you loose.
Be honest, cooperative, and friendly.
Here is another link with a download.
http://www.krages.com/phoright.htm