Anyway at this point 15k is my startup budget.  

I looked around the comps within a half a mile distance.

According to our lease agreement, the lease "ends at 12:00 noon on Thursday, Oct. 31, 2024.

The appraisal came back at $285k.

I also know that if I manage the project well, it will come in near the original estimate and at worst between the original and the high estimate.

I recommend you do this annually to adjust for utility increases and other variables.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

If location isn't a big factor (does not seem to be based on original post) I would highly recommend looking into building a barndonium or shouse in an an area where you can get a tract of land fairly inexpensive and has little zoning regs and requirements.

Thanks @Noah Corwick for the recommendation! 

Looking forward to learning a lot from  the bigger pockets  community