I'm not new to real estate per se, but bigger pockets has helped me transform my mind from a passive buy and hold owner to a more long-term and strategic investor--this is my business, not just a hobby.

This is in regards to a specific deal, so for the sake of context: The property is Vacant Land, originally had a house that the city demolished due to abandonment by owner. 

Here is a summary of the Section: - Developing a set of house rules is a good practice - The decision about whether to develop house rules for a property rests with the owner- House rules need to be listed in the lease (addenda or otherwise)- House rules must not be discriminatory ("create a disparate impact") per federally protected classesAs pointed out, some tenants may find the concept and term curfew derogatory.

Can anyone recommend a reputable source of online information to find out a property's market value, taxes, liens, owners.  

If I call the City of Chicago and ask them what the water bill is for an apartment building by me, I doubt they will give me that info if I'm not the owner.

Looked at a park in Wilkes county ,N.C. ( 9 units) very rough shape. current owner has let tenants live on the cheap if they take care of their own repairs. of course tjis has lead to deteriation of every home in the park.

I also have limited 1st hand experience, but a lot of knowledge in owner financing and notes.  

Own multiple single family rental Homes on Long Island NY

Does anyone have a similar predicament, wherein you may be able to offer multiple solutions to property owners as a buyer, wholesaler and/or agent? 

Multifamily properties are few and far in between, and most the time the owners are asking for way too much.