You need to account for: Lawn care ($25-ish x 20-ish mows per season)Snow removal ($25-ish per plow x 20-ish plows per season)Water/Sewer: ~$240 per quarterHeating oil: Stated oil consumption in the listing is 730 gals annually - I'd confirm this with the fuel vendor if you can.

Most solar engineering software accounts for average weather conditions for your zip when sizing the required system to offset your electric consumption.

The Chinese are neophytes on the consumption scale.

Some keep the water in landlord's name and build it into the rent based on historic usage, and hope that water consumption is not too excessive over the historic usage.

Another example, in a multi-family building there will typically be a single water meter, hence landlord pays the water bill; tenant family size can increase and subsequently water consumption increases with a corresponding increase in water bill to the landlord - no matter what CPI is doing.

If there is no way to throttle, how can i monitor the energy consumption from each tenant? 

So RUBS will not cut down total consumption IMHO.With RUBS, allocation is based more or less on square footage.

But I'm not sure about liability if people would be walking through my home to get to the roof deck, using my bathroom, drinking alcohol, etc. 

Just guessing alcohol and friends were involved. 

Solar properties are far more sensitive to consumption because the equipment costs so damn much.