It’s got s crawl space so fixes could run from as cheap as plastic sheathing over the ground to a pvc pipe vented out the side of the house. 

The higher value is mainly due to the fact that we're the only home with a fenced in yard and we have a significantly larger patio area than the others.The point is, all of the other 5 homes are 2 bedroom, 1 1/2 bath.

Plastic bottles, loose change, dust.

I started with a townhome/duplex/patio home type arrangement about 25 years ago. 

and they connect a plastic flex corrugated  4" duct into your attic and vent humid hot air into that space?

Vinyl siding was added at some point mostly likely the 80's, There is a well on the property and irrigation also, the backyard has a huge banyan tree that needs to be trimmed and its root system has taken over a large portion of a brick patio.

Chipping paint, plastic light fixtures, etc.

Or taping plastic sheets up as a vapor barrier?

There are more people close together, usually only a patio or tiny yard on the ground floor and a balcony up, no covered parking, more turnover. 

- this is a mess - after looking over the zoning plans for MY house ... the zoning plans don’t match my home , it says our driveway is in the front (it’s in the back) it says we have a patio (we do not) it also says we don’t have a crawl space under the house (we do) AND ALSO - it says our house of 16 feet wide - the crack begins at 16 feet 2inches ...I feel bullied and lied to by my city...