Because of that house, I will never buy a house with a completely finished basement because all the utilities and ductwork are behind the drywall.

@Kiersten Vance - no existing duct work or attic to put duct work.  

if youre into serious DIY you can run a small split HVAC with gas heat i. each unit with ductwork.

My most recent property rehab has all the existing duct in the walls from the old heating system but the furnace and all the ductwork in the basement was stolen.

This is a purpose built up/down brick duplex from the 60's.Currently the property has two identical goodman 95% efficiency forced air furnaces (mfg 09') - so no duct-work needs run.

To install 2 security lights an electrician wanted $600, obviously cutting down a tree costs an insane amount of money, redoing the duct work for the central hvac is like $4.5k, flooring, installing a door or window or anything is just ridiculous.Anyways, I requested a few quotes.

HVAC, figure 5k (assuming there is duct work in place?)

.$15K-$30K is definitely what I would expect to pay for 3x new gas forced air units installed with permits, with all duct work and soffits (framing, drywall, painting).  

This may involve adding ductwork, installing a separate HVAC unit, or using portable heating and cooling units.

The current setup will be one electric, one water, single network of ductwork/HVAC, etc.