Standard financing would require 20%-25% down and that's hard enough! 

However, there are seasoning requirements for both Fannie Mae and DSCR refinances, unless you opt for delayed financing.

That's another reason to require regular cleanings and maintenance.

No tax, no need to do a 1031, and no requirement to reinvest. 

Pro Tip: Make sure the laundry vendor names the property as "co-insured" and does not simply provide a certificate of insurance for the property's file Since laundry leases are "real property" leases a separate paragraph will spell out that the laundry lease conveys when the land is sold.... so any property that is sold while the lease is in effect will be required by law to assume it. - this is often times confusing for a new or amateur owner who may not be schooled in real property leases.

This can significantly lower your initial payments, making it easier to manage cash flow before your business starts generating income.SBA Loans: While typically requiring business revenue for eligibility, some Small Business Administration (SBA) loan programs are designed to help new businesses get off the ground.

It is different with every lender, but most would require 6 months before you could refinance on the new, After Repair Value. 

If the unit is under 500 sqft, meeting fire code, and a few other small requirements, it should be very easy to build these homes. 

PS payments to contractors and other vendors require a 1099 for amounts totaling over $600.00 in 1 year. 

(again from pub 523 - Unlike the ownership requirement, each spouse must meet the residence requirement individually for a married couple filing jointly to get the full exclusion.)