These programs are much more lenient and allow Alternative income streams to qualify such as: Liquid Asset calculations for incomeBusiness Bank DepositsPersonal Bank Deposits Expected Income New Employment income1099 IncomeCommissions & BonusesAccount ReceivablesNote Receivables Contracts for future incomeNew Rental IncomeExpected Rental Income from property planning to rentConsiderably different calculations on Tax returns 

I would recommend using the Rental Property Calculator that BP offers.

Your better bet is with the income from the business and adding back any depreciation expense you are claiming. 

I use the rental calculator 

You need to first calculate what the LLC will cost you and what the benefit is.You can look into the MA secretary of state website to see what the cost will be to set it up.

Likewise, the seller would take the sales price in the 1/3 and subtract out his basis in the 1/3 to calculate gain or loss.Something you may seriously want to consider here as well is property tax issues. 

There is still plenty of math calculations here...

This is my first time, I attempted to see my true numbers after I entered it into the Rental Property Calculator here on BP.  

I bet if you buy multiple, either company would give you a small break on them.

In the long run, heating the building to 60 degrees and having the tenants cover the rest would probably net you less overall(that's a guess without doing any calculations) but if you plan to own the building for a short period, say 5 years, I would absolutely go for a central heating system set a certain temperature, with the tenants covering the rest to bring it up to a comfortable zone.