Here are some methods I have used so far.Free Sources:- information, or free internet search like switchboard.com- pipl.com (not too bad for free - finds social networking sites too)- Courthouse records (shows previous subpoena addresses and if they have a driving offence their date of birth in my county.

I have recently come across some undeveloped land that I would like to purchase.

@Gp G.Most real estate websites (like Zillow) allow you to post your home FSBO.

It's also hard to access that equity unless you have enough properties to sell one off every few years, cash out refi do not always work for example I have a 4 unit its got like $400k equity but if I cash out refi it then it would no longer cashflow so the money is just stuck in there the old mortgage is at 3% so I won't ever refi it anyways. 

So, it's a numbers game like anything else. 

One small oil spill-yes if they didn't notice it was leaking and then got it fixed; but multiple spills means they didn't fix the car.Options to try are baking soda and vinegar or dish soap like dawn that breaks down the oil. 

These lists include details like the type of permit, property address, project scope, and sometimes the owner or contractor's contact information.How Real Estate Investors Can Use Building Permit Lists:Identify Potential Sellers:Investors can track permits for major renovations or additions.

Would you be willing to share what open ended questions you like to ask (just so I have them in my back pocket?).

Basically I am loosing 10% a month so it's like I (the owner) am paying the late fee. 

Just like your mortgage is not late til the 15th of the month.