[vincentvictor@shaw.ca]

Shutterstock has a pretty thorough list in their contributors section of their website of public buildings that are visually copyrighted and explanations of situations where you might need a signed release
A good resource for information not only for stock photography, and if you have a thick skin there is a pretty good critique section with most reviews from people (pro and amateur) who have no other motive than to see you succeed, although they can seem a bit harsh at times. Quite often they offer invaluable suggestions on improving your efforts, technique, settings, etc
http://submit.shutterstock.com/forum/
Vincent

I have a lot of stock photography accounts and shutterstock is by far the most difficult to get an account, they refuse photos based on composition settings or focus points wich are completly non-sense and subjective. But maybe its a good source of information I will take a look!
Thanks

Tough to get in, and I do know what you mean, it's hard to defend their screening practices when the reviewers are rejecting one photo one month then accepting the exact same photo with literally no changes to it the next month, but do check out the resources and the advice from the guys on the forum