Maybe I'm no longer a low risk bond investor, maybe I'm parking my money in $VOO instead, CRE REITs, or perhaps higher risk higher return bonds. 

I would advise you on the DSCR loan to implement/request a low duration prepayment penalty (i.e 3 years - 1 yr PPP).

As a result, inventory levels have remained historically low, particularly in markets where demand is high.

I have section 8 rentals in great areas and I almost forget they exist sometimes because of how long term the tenants are and how low maintenance they are.

Cities with limited land for expansion have higher appreciation than those with abundant, low-cost land where new construction is preferred.

Most investors at the time of their writing had low interest rates so their goal was to continue to acquire more mortgaged properties.

Is it doable - yes but you will need to go to a lender who probably uses their own funds vs. an instituational lender as they will not like 2nd position nor the low amount.

Also, after a year, the mortgage hasn't been paid down by much, especially if it's a 30 year mortgage.The only challenge you may run into is if you purchased it using a low or no money down mortgage option like FHA or VA lending.

Don't let the idea of a low interest rate trap you from upgrading to size/scale.

Lets say your accountant tries to write off as much as is legally possible when it comes to lowing your taxible income so that your tax burden is less and you pay less taxes.