I was just curious if I could get a mortgage on a quadplex since online I've had people tell me yes, no, and it depends.

You can use a form called an ‘amendment of contract’ form (available for free online, just google it) to alter the original language in the Purchase & Sales agreement/contract.

There are online services like Escrow.com but never used them and not sure if they would fit your needs. 

Search the company online and you will get their contact information.

coincidentially, I had this discussion with my friend last night and we ran some numbers with online 401k estimators (nobody knows what it's gonna do for real).

That is something you can research at the county courthouse or online under the delinquent tax department depending on where it is located. 

Clerk of Court, most are online now.

I followed some advise I found online (actually giving by one of the founders of biggerPockets.com) which said to look online.

I have looked at over 20 properties in person and about 300 online and this one property meets my needs and numbers. 

So I have found a few abandoned homes and located the owner online  but under the property owners name has multiple addresses and it doesn't show which address is current, it does have phone numbers.