@Tyler GarzaYour "buy a new house, rent the old one, and trade up" strategy is a solid way to build wealth, but there are a few key factors to consider.

I do not understand your remark as related to the DSCR loan.  2 ADUs are not allowed by f/f conventional financing but is not always enforced.Fortunately if you stay with the current tenant without a refi, by the time you pay principle it is likely the rent will have increased enough to absorb the increase mortgage payment. 

Loss of Use / Loss of Rents: Normally, there is a 20% included limit.

It's running a business NOT renting a house.  

Quote from @Raghavendra Jakkani: I have a single family house available for rent.

Firstly, it often generates higher rental income compared to long-term leases, particularly in desirable locations or during peak seasons.

For example the BRRRR strategy worked with many properties 10 years ago when the average mortgage was cheaper than the average rent.

I would probably waive the few days of February rent.

At 77k/door, what are they renting for?

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.