According to the brokerage and agent, these individuals either weren’t serious or claimed they didn’t realize the property was occupied, even though it was clearly stated in the listing.I’m not particularly concerned about the property’s condition or the eviction process, as I’ve already secured some level of cooperation and have basic access to the basement.

When you don't have cash, you need to partner with individuals who do. 

Alternatively they can purchase a portfolio of occupied homes at a discounted price because the seller of the portfolio in most instances first tried their hand at selling the homes individually to the owner occupant and after experiencing 13-15% in disposition fees and expenses realized its not worth the effort and better to package the assets and sell discounted to another investor.Keep in mind, most of these SFH's are in stagnant markets meaning limited appreciation and if you ever took the time to look at an amortization schedule  there's no meaningful principal paydown for many years.

There's so much content and so many individuals who push inexperienced investors to take action before they are financially ready while downplaying the risks, particularly those associated with  properties in lower tier neighborhoods.

Each bedroom has it's own individual keypad / lock.Padsplit has data on occupancy per zipcode through their host portal.

It feels like everyone and their grandma is on the Do Not Call list nowadays and my worry is the fines associated with accidently calling these individuals. 

I would assume that you'd just simply sell each individual lot to the developer at a set lot price such that your cost to purchase the raw land and improve it to buildable lots was worth the proposed profit per lot.  

If I were to go this route I would clearly identify each of these risks individually, understand how the Govt would potentially challenge each of them and then assess in your particular fact pattern how you would effectively rebut a challenge to each. 

You are talking about 22$ an hour per individual for an 8 hour day plus whatever equipment costs they need to cover.

Are you primarily B2B (contracting directly with companies/agencies) or B2C (leasing to individuals/or Airbnb)?