I just viewed what looked to be a beautiful 3 unit in the photos a few days ago, but when I got there it was apparent the building had a natural gas smell in the basement, plus the owner pays all heat for the building since there is only one furnace.

Typical RUBS is by number of people (water) or square footage  (heat).

Here are some of the options we are considering:1) Keep the system basically as is, but update it for greater energy efficiency. - Install two new high efficiency condensing boilers, and update windows and insulation for better heat loss performance.PROS - a) minimally invasive; b) can provide 15-30% reduction in heating costs (we are told).CONS - a)total gas expense is still paid by the landlord; b) individual units won't have individual control (except for a thermostat controlled shutoff valve for heat/water in each unit); c) AC would be available on with in wall/window units. 2) Try to individually meter each units' gas and provide each with a traditional forced air heating/cooling system.PROS: a)gas expense could be completely removed for landlord (huge)- even tankless hot water could be installed in each unit; b) each unit would have their own climate control.CONS: a) constructions costs of running new gas lines and soffiting sheet metal duct work. b) highly invasive with collateral construction costs; c) future costs of maintenance on multiple systems vs a single building-wide system. 3) An electric based heating system- This is tricky in my mind because of the high cost of electric heat.

This often forces a landlord to put utilities in their name to protect their property (think winter, no heat, frozen pipes).

Heat, hot water, water, sewer and snow plowing included.

Older buildings can be an issue, we had to put some spray foam around the heat pipe entries. 

The weather seems to be heating up and people will want to be closer to the ocean.

(like ac or heat where you’d probably have to pay for a hotel.).

(keep reading to end)And it’s not just shelter, it’s transportation thats heating up NBA Jam style.

I didn't see the following on the Chris Dawson's very helpful list or the equally helpful heat map.