We are leaning towards testing the waters for putting it on the market even though originally it was going to be a long term buy and hold.

Water, air, sewage?

You may be dead in the water. 

More importantly, I am fellow taxpaying citizen.Having said that, we live in a world of gray waters... a reasonable tax position is all I demand of my clients and my team.

I own a newbuild (2019) SFH rental, when build it included solar (without the batteries) and solar-hot-water-heater.

I usually fly fish Cosby Creek, and have seen 2 other fishermen on that water in 19 years.  

Renovated all apartments, converted M2M tenants to annual leases, instituted strict rental criteria, implemented online payment portal, invested $75,000 into leasehold improvements (HVAC, drainage, exterior paint, concrete.)

Balloons coming due with higher interest rates, China market, China production, Manufacturing production moving back to the US, Worker shortages, Workert pay hikes, Ukraine/Russia food and fertilizer misses, Oil prices increasing due to the OPEC Q1 production curtailments in place, Houthi issues, Panama Canal Water issues, Illegal immigration impact (buy one of those office buildings and rent for $10mm per year for Illegal housing, take advantage) social benefits required, Climate change believe it or not- Buy or sell into that thought process,  US politics, Baby boomers leaving workforce and needing more benefits, Baby Boomers moving from Stocks to Bonds,  etc.I agree things will get worse, but that means more investing opportunities. 

Prior to purchase the roof was replaced as was the water heater.

You also become responsible for making sure your tenant has a livable space - keeping all the major systems up and going - so hot water heater, AC, the roof, electric, plumbing, etc.