Good thing we have copyright to encourage encourage artists:
Making Your Case for a Permit
If you do decide that a permit is the way to go (in other words, you’re going to use a tripod), one thing they will want to know is, “What will the photos be used for?” They may ask if they’re going to be used for commercial purposes, educational purposes, to be sold as postcards, etc.
For example, on my recent trip to New York, we contacted the observatory at the top of 30 Rockefeller Center to request a permit to shoot the New York Skyline at dusk from their observatory (which would require me setting up a tripod). They had a page on their site for photo permits, and who to contact, etc. and so we followed their instructions. Unfortunately, we were turned down because we were going to use the photos in one of my books, which they felt was a “Commercial Purpose” so our request was denied.
We also contacted the Guggenheim Museum in New York, and they had a request for photography permit section as well, and they were pretty clear and adamant about the fact that both the exterior and interior of the Guggenheim were copyrighted, and tightly controlled. Despite several calls to the department that handles photo requests, we were never able to reach anyone, and they never called us back, so we were out of luck.