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. 

Keeping your current townhouse rented enables tenants to continue paying down the mortgage while you scale.2.

My target tenants are young professionals.

Buy and holds is the key to true wealth with all the benefits of depreciation, appreciation, loan pay down by your tenants, leveraging the equity, cash-flow etc etc, but it often times isn't the active income that pays the bills until you build up a portfolio and even then there's the tenant management or managing your property managers.That's why I'm involved in all 3.

And hands down the #1 violators of tenants rights (I mean legit cringe stuff) are those large communities, not investors like those who make up the majority of BP. 

As far as renting, I'd say find a good neighborhood and do good tenant screening. 

You’d be more likely to get away without parking for tenants but even then, what kind of tenant are you going to attract?

We have found that slightly higher end properties and ones that align with our likes attract tenants that we can relate to. - Once we like the property we run the numbers on rents. 

The appraisal came in at 715k. 38 pads, 23 trailers, 100% tenant owned.

I have been sued multiple times by tenants and never did a thing wrong and never lost a case.