We are looking at maybe asking hard money lenders or private money lenders if they’d want to come on as strategic partners, but we need suggestions.

I'm a long distance investor.

We are looking at maybe asking hard money lenders or private money lenders if they’d want to come on as strategic partners, but we need suggestions. 

I am NOT interested in owning any more real estate (retired here man) so I had planned on just paying my 15% long term Capital Gains tax rate and moving on to my "safe money" retirement program of MYGA's / CD's and High yield Savings account / Bonds / some Stocks.

I've been a member at Bigger Pockets for years. I've gotten lots of information here, from lots of great people, but "life has been lifing", as they say. 
So, I'm getting nearer to retirement and have seen plenty of ...

How long do you typically wait for a rental property to sit on the market before considering selling it?

Sounds like any non interest bearing account would do as long as its a separate account for the security deposits.  

As long as they are not a one company town.

In other words, sufficient capital for the cash purchase of a property (plus rehab) and eventually refinancing the completed project to a long term loan.

I would focus on established markets that are still showing growth and have more than just one draw.Taking my main market of Tampa Metro as an example - There is more than just beaches, you also have MLB/NHL/NFL + Spring break and MLB Spring training, aquariums, golf, casino, new downtown development, and a lot of business travel.You want to avoid markets with just one draw, as if something happens to that draw, you will be hurting for who knows how long.