@Abel Curiel, When I first drove by this property in my initial search it caught my eye...out of the 100 or so properties i had on my initial list this is the only one that I had memorized the address of. 

Some common names you'll see thrown around a lot: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend you search for each of those apps online and see what they offer, how much they charge, etc.

Get a title search done. 

Internet searches are abundant; here's one:https://www.proinsgrp.com/should-i-add-my-landlord-to-my-ren...

Quote from @Amit Chugh: While searching for apartments, i noticed a commercial apartment listed as Section 8 property, does it make any difference from buyer/seller perspective when it's listed as section 8 property.

(he was able to close because the title search had already been done before the lien was registered) According to him he has never not paid them for previous work and he never said he wasn't going to pay them but as soon as they found out he was selling they filed.

Keep searching for lenders because you're speaking to the wrong ones. 

You can also find real estate investing groups through meetup.com, Facebook, or a Google search.

Looks like they are all not getting along:Orange County Clerk of Courts Records Search (myorangeclerk.com)

Here are a few suggestions on how you can maximize the wealth of information available: Check out the blogs and podcasts, or take advantage of the search feature (magnifying glass).