The property is being sold as raw land below its tax-assessed value.

I had no tax liability in 2022 and now here in 2023 I do.

Taxes are also always going to be a consideration, and this is an assessment year, so you should account for them going up more than usual in your projections.  

Ignore the loan when trying to factor in the possible tax implications as paying off a principal balance doesn't do anything tax-wise.

I pulled them from the tax assessor's website, just going one by one through each parcel to locate and identify the vacant lots.

If you are setting aside funds for capex, taxes, insurance, or other expenses that don't occur monthly, transfer those funds to Savings each month and hold them there until it's time to spend them.

Typically, it just refers to the number of units/leases you have, not the number of tax parcels. 

I have some questions about the material participation rules for the STR tax loophole.

Given that you've owned them for almost 5 years, there is also a good opportunity to do a cash out refinance and obtain tax free money that you can use to expand your portfolio even further. 

When evaluating rental properties, aside from school districts and convenience, consider factors like neighborhood amenities (parks, restaurants, shopping), rental demand, job market trends, property condition, potential for appreciation, and rental income compared to expenses (including taxes, insurance, and maintenance).