All have older 25+ year old gas boilers. 

That said, please provide your input on any and all of the following assumptions:-Repairs & Maintenance: 10%-CAPEX: 5%-Vacancy: 5%-Property Management: 10%-Water/Electric/Gas/Garbage: $0 (Assuming you could pass on this expense to the tenants.

The broken vent pipe and disconnected shut-off valve should both be pretty simple fixes, maybe $200 - $300.The gas fireplace would probably have to be replaced and could cost $3,000 or more depending on what you get.

The heat exchanger is fabricated from natural gas pipe. 

Factoring in tolls and gas I’d be paying around $200/ month.

You will also likely need street/sidewalk closure permits at different points in the jobUtility Taps- Water, Sprinkler, Sewer, Power, Gas, Cable (this is likely negligible as the cable company should do it for you)Excavation/Foundation- Are there buildings on either side?

I purchased a house two years ago and UGI didn't want to put the power into my name because the previous owner had a 1600 gas/electric bill. 

The deal would be paid in cash.I called the utility companies and for electric water and gas the total average is $624 a month.  

I would've like to make my case of being grandfathered in for the simple fact that the previous owner (whom is close to 80 years of age and self managed as Owner Occupied for over 35 years) had tried in the past:  1st - To reduce taxes because it's listed as a 3 & 2 but then the tax site has it as 6+ and when the old man had them visit the buildings they seen 7 mailboxes that USPS installed( so he decided to stay shut and not pursue it) 2nd- The 2 family already had 3 gas meters and even a fire escape because the 3rd floor studio apartment only has access thru back door.The front building has 4 gas meters, 1st floor, 2nd floor, 3rd floor and one for the front Studio apartment (which is like a basement apartment) but its street level with main entrance off sidewalk. 

One I recently bought.....I couldn't find the meters for the gas or the water.