It depends on your approach...

If so I would consider approaching the Eng Dept at a local college or University for a class exercise estimate. 

This also assumes the Park is on city water and sewer and not well and septic...As far as the stick home goes you should seek to purchase the property without it, but if you have to acquire it then yes using comps is the correct approach.  

But one commercial deal can make your whole year.I was approached by a group wanting to buy a hotel in the Houston area.

I understand not everyone has the manpower resources that I have to do a quick 1 day overhaul, so this will approach will account for that.

CAM's work for the Board, but take the "I'm a friendly investor, concerned about my investment" approach with a heaping spoonful of sugar.

I just don't know the pros and cons of that approach.

When someone approaches you about a loan for commercial real estate, what characteristics about the property are of most interest to you?

@Mike WoodThat's exactly the info I am looking for, this would be my guide on how to approach the banks.

I have been approached by a company looking to rent it out on behalf of 4 employees.