A good manager can improve performance for a mediocre investment; a bad manager will kill a good investment.

We invested $55,000 in key renovations, focusing on modernizing the interiors, improving curb appeal, and ensuring the property met market expectations.

From the sentiment of your post it seems like you're viewing the buyers as strictly investors when they may lean more towards traditional homeowners looking for a quality of life improvement or an improvement on their current financial situation today.Let's say the buyer pays 465k and has a 5% interest rate.

But let’s go a later deeper - my down payment would come out of a well performing stock portfolio.

Tapping into that equity through a HELOC or cash-out refinance and reinvesting in higher-performing assets could improve their ROI significantly.

And sometimes, we are not materially improving what you could have done  yourself. 

University of Kentucky and Lexington-Fayette Urban County Government Land Swap: In 2018, the University of Kentucky exchanged 250 acres near its Coldstream Research Campus for control of several important roads in and around campus, contributing to economic development opportunities and improved urban planning. 

Don’t forget heloc, DSCR, 2nd on primary, borrow from retirement accounts, credit card cash advance, property reserves, home improvement store credit, etc etc.

How do other regular condos perform versus them? 

The asset class will be dependant on how much capital you have availabile and how much renovations you plan to perform. 2) Is there an income gap between going after 2 units as opposed to 4?