I didn't notice anything pop up after a short search, but I'm sure there's something there if I dig for it more effectively. 

It's says the new laws were put into effect January 1st 2021.

During this time, there was a sign hung up on the property saying something to the effect of "This property managed by HoltonWise."

If so, is this right and/or how can I eliminate the double taxation on the same service? 

(other than the tree you mentioned.)It is good that you note the lots are flat, that should eliminate the need for any dirt haul in/off, and any retaining walls. 

Yes, but you can always refinance to eliminate. 

@Jason Wray I don't know if the effect will be too large, as it's just a portion of the total and spread out over a 2/3 of a year. 

If you don't have mortgages on the properties, it can be cost effective to do a property package policy with a commercial insurance company for the rentals - this is where you can insure multiple properties on one policy. 

When investing, you typically want your money to be as effective as possible, but that's not to say there are non monetary things that add value to your investments.

I don't 'encourage' anyone; if they want to cooperate great; if they don't, that's even better they just eliminated themselves and saved me the screening time.