Successful fisherman know that 90% of their time and effort goes into planning and keeping equipment ready to perform and not actually hooking or reeling in the catch..often closing on a popular or active vacation rental (often in a competitive market) happens along the same lines (no pun intended).

I also have a contracting/remodeling background (mostly custom kitchens & baths) in CT, and am finally delving into the REI space too. 

I think 25k to furnish, stage and stock with essentials (linens, towels, kitchen, etc.)

Will a good concrete company have access to the necessary equipment to grade and dig to prep the site or is it customary to have to rent that equipment for the concrete work to be done?

Should be way less than $40-50k, The Container Stop quotes around that for a 20 footer with a kitchen and bathroom 

Especially considering zoning approvals, permits for land development (Local and State) moving equipment in, then permits for individual houses before you can even sell or market.  

Some drywall replacement, repainting, need to add a backsplash to the kitchen, maybe replace cabinets, flooring could be redone.

For example if someone has owned a house for 5 years, but did NOT refinance in 2020/2021, they left thousands of dollars per year on the kitchen table, which most people will not voluntarily do if they have another choice.

According to HUD Fair Market Rental Rates for 2024, the market rent for each unit in the 34608 zip code is $1,700 per month.While the units are in good condition, consider updating the kitchen, bathrooms, and fixtures and adding a fresh coat of paint for a fix-and-flip strategy.

I had sewer backing up into a basement and sure enough the city had done work with heavy equipment and crushed the old tile line.