We would plan to take our current main location which is the largest and downsize in the same business park. 

According to my handyman all three of the thermostats I have in my single family rental property are no longer functioning and need to be replaced.

A desired profit is somewhat a function of the risk taken.

Frank Rolfe of Mobile Home Park University, who is the 6th largest owner/investor in mobile home parks in the US according to Wikipedia, advises against developing a new mobile home park.

Should I try to get pre approved for the largest loan amount available (and I'm comfortable without being over-extended)?

I'm new to the forums and didn't see/missed the search function, so if this has been answered already, my apologies. 

A b C D is also a function of AGE..

I also interviewed the CEO of the Pittsburgh Cultural Trust(One of the largest RE holders in Pittsburgh) one on one.

One has a non-functioning wall-mounted gas heater and the other one has an electric baseboard heater.

There are some great meetups in your area; the BWI meetup comes to mind (it's one of the largest in the country) as well as Greg Bennett's meetup at the Greenbelt Marriott and Andre Johnson's Deals Meetup at National Harbor.