Normal helocs aren't meant to be transactional so there are some differences there, and term etc.

If you are then you can ask them if they would be willing to also take a look at the leases and other paper works as part of the transaction if they say no, call attorneys until one says yes.

Learning a new market isn't as easy as finding a deal - you need to have a team, understand demographics and have a network in place to support your transactions (pre and post close). 

It will become easier after you get a few transactions with them and they become more confident in your ability to repay.

Everyone is a buyer these days and finding them is the easiest part of the transaction.

I have done my research but it seems that everybody forgets to explain how the realtor gets paid in this transaction.

Build a relationship with them. 2) An agent could work as a designated agent (solely representing you),  dual agent(I would NOT do that), or transaction broker(they represent the transaction but give NO advice)3) No difference between the process.4) Financing is the same just walk it before offering. 

Typically transactions go through seller's brokers.

Is there a 1031 rule that limits the number of parcels (sold a single transaction) that one can roll over to one larger multifamily property?

I would NEVER rent out an illegal space.