HVAC contractor will:- supply and install 80k BTU 92% gas furnace on first floor- supply and install 3 ton coil- supply and install 3 ton condenser- supply and install 5 zone fujitsu mini split system on the 2nd floor with copper lines and slim duct (2-7k indoor, 2-9k indoor, 1-12k indoor units)- supply and install new duct grilles and registers- supply and install new refrigeration piping, exhaust piping, thermostat- supply and install new natural gas piping to accommodate gas load Estimate is $17,700 and I have no idea if this is fair or in the ball park.Any help or direction is much appreciated.

Is the coverage able to accommodate multiple properties, in multiple occupancy phases?

Also, please keep in mind that the current cost to build new construction residential is around 230-260/sqft. example: $230/sqft×2500sft 2 family structure or 4 studios offering 625sqft/unit =$575,000factor in  an additional cost to provide adequate parking and accessibility to accommodate 4 tenants due to topography and building design and Voila! 

If they want to be home, then they need to be more accommodating.

Game changer but you can re-work you offer to accommodate ? 

And the world does need more dense zoning to accommodate the increasing populations.

Looking for a place downtown, to accommodate those that don't live in the Elk Grove area.

There are lots of way to structure a business, and lots of considerations when doing so (reduction of taxes and liability, future sale potential, to accommodate different owners/partners, etc.).

The tenant can then use the savings from not having to pay rent to get other accommodations until they can return. 

If you want to give him another chance, send him the letter and also add in that if you don't hear back from him with a day or two, you will be sending him your notice of not extending his lease.And I am sure someone will tell us why this isn't a great idea, but you might even consider trying to find another accommodation for him.