At closing, the buyer and their lender determine whether the credit will reduce down payment, closing costs, or as a credit.5.

Generally, lenders will require you to have a substantial down payment.

If we do a Self Storage development we expect a 400% COC return.  

Rent was due by 5th but no communication on late payment and is not responding to my text/emails. 

Multifamily doesn't need any more pressure/demand since cap rates can really get low when too many people pile in, but I have to say that commercial real estate (including large MF) and other types of passive investing (mobile home parks, storage, etc.) can really make like much easier.

I helped a client get a combo car wash- self storage property a few months ago here in DFW.

You might get these days 60% leverage so you'll likely need 40% down payment plus reserves and the financial institutions will want you to keep those capital reserves in their institution.If you are a new investor, there's a couple of opportunities to get started. 

Financing: I'm confident I can put $10,000 down as a down payment within the next year.

What % of purchase price is smart to put as a down payment? 

If it’s verbal, they’ll need to document any prior communication or payment records to establish the relationship.If the PM is completely unresponsive, they may want to send a formal written demand for communication and payments via certified mail.