I was wondering what your experience has been, good or bad with buying rental property in close proximity to the firehouse/station?

On properties that stay pretty booked up too. 

Buy a quality property, stay away from the hood, rehab it as if you would move in, take your time picking a tenant, you'll be find.

Similarly, if you put several Class D tenants in a Class A 4-plex, what do you think will happen to the property?

Quote from @Marshall Stanek: NEVERMIND.....I found it by digging into the different Forum Category drop downs.FORUMS > Events and Networking > ClassifiedsThis is the only place you can market a property for sale.

After 8 years or so, you've got three or four properties and the world opens up to you at that point. 

Funny enough, I was going to suggest you move out of SF due to the high cost ;-) I'd suggest going down the SF condo route to start as financing for commercial units is a lot more difficult than residential properties.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

Awesome job with getting a cash flowing property!

I think Indy is a great diversity of communities and properties, so anything you would like should be here.