And what extent do you use green board in wet areas - just in the shower?

I think if you don't have some clause in the lease and you never discussed anything about leaving the furnace on (not that verbal would help in court much) you might be eating this one.

you tenants will eat you alive, this is Baltimore City.

However, out of state, the costs with managing would eat into any profit margin.

@Niels Bjørn Toppenberg The big lesson was: Don't ignore the red flags just because there are a couple green ones.

Just what I have done.By the way - cars eat wealth.  

But, while we were in escrow, some green spay paint appeared on the ground marking a location.

Although I am very green to the process, I want to do things in a professional manner.

That way you won't have to worry as much about the market changing in the next year.I like the idea, but if I flip it right away, real estate transaction costs will eat the profit and I will have done all of this merely to pad the pockets of the real estate agents. 

Nice green kitchen...granite and tile get ordered tomorrow :)   I can't wait to find our next flip!