My property was originally purchased as my 1st home, so if I would live in the area myself, then I would recommend it to over investors. 

I tried to post an "update" to my original post, but looks like I don't know how to use this feature.PPS.

@Tanya Maslach What was the asking the price and what was your original offer?

We originally used them for our flips, but now we sometimes wholesale broker through them.

Firstly, well done for persevering and trying every avenue you thought would get you the data you needed.Most would have caved earlier and handed out there hard earned cash for old, saturated leads/records from the same prominent platforms which dump them pretty much when they receive them from either 1).the same large brokers AFTER the county has listed them on the county website or, 2). from the counties themselves directly AFTER the county has listed them on there own website, or, 3). from data scrapers on Upwork/Fiverr who scrape the data from those same platforms AFTER the counties/brokers sell those platforms the data being scraped by the freelancers.Anyway, rant aside you seem to of made the same mistake i made when I first started branching out away from providing leads to my original couple of clients i got from Upwork who wanted me to scrape data from court records in FL for pre FC leads.Simply, I didn't know where to look for the information I needed in states outside of FL.FL only allows the judicial route to foreclosure so I only needed to know/find/scrape the data from Lis Pendens documents for counties they requested.

Property was on market for about 170 daysI originally started the STR plan for tax benefits and plan to do cost segregation as i fall into high income bracket (37%+ 11% state) saving around 50k for 600k property.I have no plan to personally use the property and this is purely investmentI thought i found a great deal because properties in the area are selling for 205-220 per sqft.

Note origination where the borrower owns multiple properties with little or no debt, needs a loan for an acquisition, but can’t produce proof of income sufficient to get institutional financing.  

. - BUT, it also appears old and probably a symptom of the original house settling.

Originate my construction loan by end of 2025 Q1 for a 21 unit school building conversion5.

You're increasing the need for hot and cold air dramatically and it's doubtful the existing system will be adequate.But, in answer to your original question - yes you will need a permit.