There are quite a few around, one at the old pole farm in Ocean Gate. There also was one at Forsythe NWR at Oceanville, i.e. Brig, but it was recently removed. There is a F&W Peregrine report that lists all of them. Mclain was a close friend, he passed on 4 years ago, one of a kind.
A few years ago we installed a platform & rebuilt a falcon nesting box atop the arch span of the Tacony Palmyra Bridge. It replaced a previous wood box. I guess the doghouse is a better idea. Our work can be seen here: http://www.palmyracove.org/FalconCam.aspx
There's an article on page B1 of today's Phila Inquirer about the LBI platform. Up top is a "dogloo", and Ben Wurst (of Conserve Wildlife NJ) bought it at Pet Smart for $229.99. He also is the one who built the platform for it.