You can also make the deal a little better for the seller by assigning rents as collateral and even a maintenance fund if necessary, that would be a cash account that would be maintained with enough funds to equal one months receipts.

The SAFE Act defines the mortgage or equity lending by the virtue of holding a security interest in property collateralized.

The mortgage is secured—or collateralized—by the house, the buyer’s name goes on the title and the mortgage is recorded with the local government.2.

They're always quicker, are unsecured so no need to pay title fees, no collateral so no appraisal costs, and can fund in 5-10 business days.Qualifying for this kind of debt is stritly based on personal credit, income, DTI, etc since there's no collateral, but might be a good option for you!

I'm sure the mortgages will be considered collateral, but what else should I know? 

How much money do you have or assets you can collateralize at 65% with a bank. 

You will have to come out of pocket, or collateralize the homes (if your market supports it) to infill any park that is not full.However don't take your eye off of the ball managing the existing park and tenants. 

how about additional collateral in lieu of down pmt like 2 free and clear SFRs?

Basically, you would make arrangements to put up your land as the collateral and then they bring the financial loans for the infrastructure.

HELOC- a no go too high of DTICross Collateral- don't want to risk our only home (we have 2 small children)Cash out refinance- must wait 12 months with one time payments since deferment Sell property & use net equity- we want to keep it and turn it into an airbnb/short term leaseWe want to purchase a MFH or maybe wholesale is a better option for now.