In addition, owner loaned us $100,000 at 6% simple interest for one year to make major repairs (installed heat pumps, replaced boiler (for heating water only), replaced some siding and major roof repairs.)We were very clear with each other what we each wanted out of the deal.

Her heat had gone out and she had called a seemingly reputable HVAC company to come take a look.

It will still be expensive (especially if your heater is gas), but may be cheaper than updating all the gas lines buried in the slab.Yes, converting to electric will be expensive and using electric for heat / hot water is more expensive than gas, but both can be converted in a day or so without tearing up the slab or having the tenants move out. 

Blinds installed, burn hole in decking repaired, HVAC unit repaired; not blowing heat. 

I am expecting to see at least 5 of these criminal cases before the market heats up again.

Has, heat, water, taxes etc.  

Had the seller fix the electric and heating as well as bring the units up to city code.

LA heat in the summer is fun. 

Tenant said it died with heat wave despite his efforts to water it.

@Alejandro Ferrer you can have thermostats that limit the temperature the heat can be set to but where are you located that you think they can turn the heat off when they aren't home?