But, it's not waterproof, not even very water resistant.

Therefore water/energy efficiency is of the tenant's concern and not mine, in addition to the condition of fixtures within the suite. 

I have made a number of capital project improvements including insulating the entire building, renovating one unit, and installing two new water heaters.

HVAC - you should be able to check the year that a furnace, boiler, or water heater was installed.

You when then need to determine the expenses on the property such as taxes, water, trash, electric, maintenance and etc.

I am long time listener of the podcast and I am so excited to connect with likeminded people.I am a part of the Quiet Waters Realty Group team through eXp out here on the east coast of North Carolina.

Values depend on location/gulf access, bridges, water/sewer assessments paid already, etc. 

It had a old oil boiler now putting in a gas boiler, using a new electric water heater for hot water.

Engineering, fire hydrants, water, sewer, office, landscaping, dirt work, water/sewer/electric to property, etc, etc.

I'd get a task rabbit or your PM to take a picture outside every month to help ensure the yard is maintained...watered, weeded, cut.