The first is the interest rate, my guess from the information you gave is that the loan is about 6% which isn't all that bad, but high enough to consider paying it off versus investing in some S&P 500 etf (depending on your marginal tax rate). 

The high volume guys are working on very slim margins.

It is eating into my margins and was curious if I am overpaying for maintenance..? 

Of course low risk typically equates to low margins but passive for duration of lease for as long as tenant performs.  

There are VERY LOW MARGIN in new construction...it's a volume game, not a one-off game.For reference, we did a framed single family with a front brick veneer in Bucktown in 2020 sold in 2021 for $179/SF....we probably should have been closer to $165/SF but had some lessons learned.  

Margins are small, and to me, the real wealth-building in REI comes from the long-term appreciation, not the short-term cash-flow.Anyway, welcome to the forums.

The large margin of profits when developing single-family homes and duplexes is significantly more than fix and flips.

I am an experienced flipper, and I got into this deal with plenty of margin, so cashflowing out of it at the end is not a concern, but I need the liquid cash to get it there. 

My view is that I can get a higher return by parking that cash in real estate as opposed to having some fund manager get me marginal returns on my savings.Appreciate any thoughts or comments.

In lower vacation/rental cycles of the year your margins could get compressed.