“Because large buildings are cheap.”
Completely Surreal Photos Of America’s Abandoned Malls
http://www.freerepublic.com/focus/f-bloggers/3657255/posts
Up to 25% of U.S. shopping malls may close in the next five years, report says
http://www.freerepublic.com/focus/f-news/3556989/posts
Thanks. There are some high costs for keeping large buildings, though (property tax, maintenance, etc.). Necessary high indoor humidity adds to the problems.