They lowered the “taxable value” by 40-50% and then raised the tax rate about 35-45% lowering everyone’s taxes that year.

Negotiating a lower price to account for these issues could be an option, but if they’re not flexible, it may be best to explore other opportunities.Happy to connect if you’d like to discuss further!

I would look at the DSCR loan as the first option.By the way, I suspect you are going to be disappointed by any refi appraisals   ADUs typically appraise poorly   JADUs can lower the property value Vs having the space as part of the primary unit.  

So demand for travel is lowering back to historic levels while the supply of STRs in many markets has increased by a lot.

You borrower at a lower rate to invest in something higher.

Seller financed loans where there was no downpayment- See #2 above as typically seller financed have lower rates, longer terms and higher LTV.

I'd focus on deciding what you want to do (flip-high risk, but potentially high return...or large loss; short term rental-more work, but higher return than long term rental; long term rental-less work than the other two, but lower return).Once you've decided which you want to do, then focus on getting the best house to meet your goal. 

I think it can certainly be lowered as in Broward and Dade, it is more than 2% of the assessed value of the property. 

Some can be passive investments, while others are full-fledged businesses.Long-Term Rentals (LTRs) are the best starting point for most investors because they offer consistent income, lower management demands, and a truly passive approach.

Alternatively, your in-laws could partially gift the property by using the annual gift tax exclusion ($34K per couple annually), lowering the sale price and their taxable gain.