Start with local regulations.

The term "material amendment" as used herein shall be defined to mean additions or amendments to provisions of these Bylaws which-establish, provide for govern, or regulate any of the following:  (a) voting; (b) assessments, assessment liens, or subordination of such liens; (c) reserves for maintenance, repair and replacement of Common Elements; (d) insurance or fidelity bonds; (e) rights to use of the Common Elements; (f) responsibility for maintenance repair of the several portions of the Property; (g) expansion or contraction of the Property, or the addition, annexation or withdrawal of property to or from the Property; (h) boundaries of any Unit; (i) the interests in the Common Elements:

You keep it for the time specified in your state landlord regulations surrounding "abandoned property".

However if there are specific codes or regulations pertaining to the definition of a bedroom then they would most likely dismiss the appraisal as erroneous. 

Gene Trowbridge has a great book called ”It’s a Whole New Business” which is very educational.  

Environmental regulations are only going to get tougher going forward forcing oil heat out of favour in time. 

If you are the new owner(completed the purchase), then you should be able to use Rules and Regulations at the property to determine what can and can't be done and by whom.

Before you do anything or take anyone's advice on the interweb you need to sit down and study/learn all your state landlord tenant regulations.

I would also guess that you have not spent any time studying your state landlord tennat regulations.

This is nickel and dime stuff but everything counts. 1) could you contract with the cable company to get a kickback for tenants who sign up with them2) could you sell renters insurance to your tenants and get a small kickback3) if your electric is deregulated, you could get a small kickback from the electric company for choosing which plan the tenants use.A lot of this may be regulated by the state you are in so not sure if it will work.