Its finer than gravel and over time gets compacted down to almost look like a solid surface.

You will need to make it look real nice, stainless steel appliances, granite, hard surface floors etc. 

You want air as well as surface samples from any active colonies growing inside the house.

*Live in California where house prices are steep and basic numbers (gross rent multiple etc) on surface look no good so looking out of state.

We’re planning to add an additional bathroom to the main unit to improve value, refinish some surfaces in the downstairs unit, and landscape our backyard.

Although you say "never," most just take a long time to re-surface because the asset manager is trying to clear title issues or there is some other snag in the process.

Because ofthe concern for lead paint ingestion, all peeling paint conditions must include scraping, priming and double coating of surface areas.

@Mindy Jensen, my initial guess is you are getting solar radiation off another surface. 

However, some investors have a "bargain" mentality so paying way "over list" is simply not something they will consider....it goes against a core belief, even if it still appears to be a good deal on the surface. 

This is just skimming the surface.