If you think that is the expected outcome of owning rental property, you should either learn where and how to buy, or invest elsewhere.

I currently own a duplex that is cashflowing at 14% COC for 2 years and i figure the more doors the better.

Most lenders do not service their own loans and reserve the right in the future to sell it- even credit unions and 99.9% of banks. 

This included some landmark deals including Rockefeller Center’s $3.5B loan and Miami Beach’s Fontainebleau $1.2B refinancingAlternative lenders filling traditional banking gaps with short-term solutions which has already begun a cycle of consolidation that will likely continue and accelerate in 2025The Office Sector Divide:CBD property values are down 50.7% from 2021 peaksClass A office properties seem to be in their own vacuum of prosperity with trophy properties commanding premium rents ($100+ PSF nationally, up to $247 in top markets) with strong occupancyHybrid work continues impacting older building valuations which have not faired as well, but this may begin to rebalance as more companies are instituting mandates to return to physical officesChallenges & Opportunities:$1 trillion in loans maturing by 2026Interest rates up from 3.5% (2021) to 6.74% (2024)Experts such as AEW’s Michael Acton and Blackstone’s Nadeem Meghji see the best entry point in the last 15–20 years and we agreeMarket Outlook:Current market conditions present unique opportunities, with inflation-adjusted prices at historic lows and yields at decade highs.

Quote from @Roy Gottesdiener: I own a rental portfolio that generates around $1,600 in monthly cash flow and has $400,000 in equity.

I wouldn't necessarily recommend that a family with 3 kiddos go out an buy an STR but since you already own it and have it furnished, its a pretty easy trial.

My idea is to find another buyer who has cash i.e. their own funds, access to hedge funds etc I just don't know if I should list it on MLS or where to find this type of buyer quickly any ideas for a super quick sale this would be as is the title is already ran and I just did renovations on both properties?

If you look up Pittsburgh and would like to talk I own over 150 units in the area and would be happy to have a discussion about the area if you'd like. 

You mention Amazon, look at how they play suppliers off each other and even create their own supply chain.  

Make a plan that eventually leads to owning property that throws off cash after you purchase it.