I am a small LL with 13 rental units in 9 buildings. Most all i have is row homes or duplexes with 2 units in one building. I manage and do most all my own maintenance with the exception of most of the major stuff. I ...

At times they also limit debt levels.  

He probably is well aware of your experience level.

I do understand that the interest rate is typically lower for a 15 year mortgage, but if you can afford the note on the 15 year mortgage, you will actually pay the debt off faster by financing it on a 30 year amortization schedule because each payment would be an overpayment due to the lower monthly payment requirement for a 30 year mortgage.  

We do a lot of work in flood zones and from what I've heard regarding "stilts"(we call them pilings) is you're looking at 20-30k extra over a traditional slab with a crawl space....Most of our footings are within a couple feet of sea level so we've never needed pilings but if you're indeed that deep you defintiely can't pour a footing on top of muck.....The other concern is flood insurance - the lower your first floor elevation the higher the flood insurance - I'd imagine if your first floor is under 10' the insurance would be astronomical.....your best bet is to talk to an engineer, get a survey, and go from there.

That level of skill will likely come with more experience and tepetition.

Need to look at the depreciation, the tenant has a faster schedule than an owner, look there as to who can write off expenses quicker and negotiate from there. 

s are flow-through-tax-entities, so they both have the same tax implications on the federal level.

In answering the question, knowing the level of house is helpful.  

At the very most, we will have to pour a thin layer of concrete, if the leveling is too out of place.Would you have any suggestions for investor friendly companies that sell A/C units at a decent price?