Cars that old are very hard to identify. This one looks like a commercial vehicle, maybe a shuttle used by a hotel. You might post it here, they're good at antiques: http://forums.aaca.org/forum/107-pre-wwii-photos/
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http://forums.aaca.org/forum/107-pre-wwii-photos/
I will guess it is a Cadillac from just after 1910. Here's a site showing a car with similar details (different body) listing it as a 1911 model:
http://theoldmotor.com/?p=129520
The experts at the AACA "What Is It? forum linked here can probably identify it.