For instance, if it was bought in 2010 for $100k, but the area has seen a 30% increase in property values, then the equity in the list vendor's system will be too low.

I have checked the data on AirDNA but couldn't see the entire data since I haven't subscribed the membership.I am also interested in finding out whether my house in King City is suitable for applying for Secondary Suite program ( we have an unfinished basement with seperate entrance) and any other strategies to increase the income stream on the property?

Is there a way to reverse this, and make the purchase price known for the sake of fighting taxes, or the opposite, increasing comps in the area, etc?

In other words accounting for the increased cost of advertising during a vacancy or do you just have to manually inflate the property management fees?

HelloFrom what I understand, with no experience in real estate investing, mobile homes only depreciate and that banks don’t see them as having any increase in value after repairs.

Myself I have a building  background and possess journey level skill in almost all trades except maybe doing concrete work and I am also an architectural designer so I perfer properties that can be increased in value through forced appreciation and look for properties where the zoning, set back, and other requirements allow for adding square footage to a building but others perfer invest in turnkey properties already fully occupied whereas I like working with empty buildings. 

In my experience the inspectors were fairly "petty" when it came time for the Section 8 annual inspection / rental increases. 

“We feel good about the business.”According to the China Financial Weekly, GEA’s net income in China has increased 80 percent since Haier acquired the company, and its revenue increased 11 percent during the first half of this year.According to: https://thinkkentucky.com/kyedc/pdfs/100jobs.pdf adding just 270 manufacturing jobs to should add nearly $30 million value added.This knowledge should make a compelling case for investing in Louisville, as if we need more reasons! 

I'm not 100% confident in my answer, and I don't recall seeing this addressed on the forums.Can you please let me know how you address this question when it arises?

I think the first time you clear away the "jungle" you indeed increase the value of the property.