All you are doing is playing catch up to your cost,...you cost being the cash you put into every deal. 

Plot 1: 2024 market value of $6,900. 45x120Plot 2: 2024 market value of $3,800. 100x94I'm still pretty new to the game, so I have no experience with land deals, ground up construction, zoning, things of that nature, and am wondering what the best play is.Sell one to help with acquisition costs and build an ADU on the other?

Investing is different from speculating, in that it’s data driven and therefor predictable and you have factors that play in that covers your downside and strengthen your chance of upside. 

Seen that play a few times.. this whole sub to being taught to under capitalized or starter investors who don't know what they don't know and learn this on line is just so very dangerous.

You’ll be playing for appreciation and rent growth.

I do think house hacking and small multifamily are the best plays at the moment. 

If we sell, we will have between $150-200k to play with.

You don't want to start playing sides here and getting involved in these kinds of debates.

If he makes less 94K a year and married he can take advantage of zero tax rate which would come into play. 

Main thing I would think of if you are targeting families are things like pack and plays, cribs, gamerooms for kids, etc. as well.