@Tommy Dang I would not bother upgrading the heating system to sell.

He gave me the typical MLS sheets that have the MLS number, a picture on the Left Upper corner, and all the details on Taxes, Sq Ft, Flood Zone, Zoning, Heat type, sewer, water, parking, etc, etc and it even has the paper clip link with Deed, Seller Disclosure, maps, additional pictures BUT there is no indication or note of co-broke fee in it. 

What are the unmaintained/older mechanical systems that may need replacement soon,    How are the utilities /heat set up?

If there's a common heating system for the entire building (or multiple units within it), that would be an additional expense for you.

For crime always like to check the Trulia heat map and BestPlaces.net. as well as driving the neighborhood.

I would be inclined attempt to work with him as he is in place and it will save me some money to do so, and he at least has earned the opportunity to make it work...just not at my expense.  

Deducted expense for 1 night that they had to stay in hotel and couldnt live at home in the heat.

Electric baseboard heat and 1 wall AC unit per side.

I have no clue how much this bill would be in your area)Trash $- Heat/Utilities $- HOA $- Cap Ex and Ops $200.00 (This the fund that will replace common hallway lightbulbs and the roof eventuallyInsurance $125.00 (assumption)Mgmt Fee $300.00 (10% of total rents.  

The outside portion of the brick may be in good condition, but the inside that was exposed to heat may have caused cracking in the middle somewhere.Probably one to buy for the land and location, not the structure.