If you fear that, have a weight restrictions like you would income or credit restrictions for a tenant.

Also, have your title searched and see if they put a deed restriction in place, if not, you should be able to sell.

When you decide to sell, the profits would need to also go into your retirement account.There are some restrictions on the actions you can take when you have a property in a self-directed account.

If the deal is set up correctly (legal restrictions for joint ventures), see if you can put in small amounts.In the old days, before my gray hair, you could learn a lot by buying an investor breakfast.

Maybe I need to switch to off market marketing campaigns or switch to a cooler market, but if I stay with on the market properties it seems that more seasoned investors (or retail buyers who don't care about the numbers as much) will be sweeping up all the good inventory.

I can’t wait for the time that we could travel to Peru and Texas back and forth with no money or time restrictions.

Outside of any HOA restrictions, the STR market is very flexible there. 

As @Ryan Johnston mentioned rent restrictions can kill a condo investment.

What is the objective of your direct mail campaigns you describe above?

All-in-all, no deals done, but I consider it pretty decent for a first run on a direct mail campaign.