Hey Nathan - this is the million dollar question.I would take a look at all of the MLS data sites (zillow, redfin ect), fb groups / marketplace, craigslist, and other marketplaces where FSBO properties are listed.

After few hundred dollars in permits and drawings, submitted to the city, got  approval to move forward in a week :-). 

You can get reimbursed for cleaning if guests smoke or bring unauthorized pets which easily can be a few hundred dollars per incident. 

By renovating the loft, we were able to get top dollar for it on Airbnb.

And, yes, there are years of data points to validate that just within my office, tens of thousands of dollars of wasted appraisal and inspection fees for deals (mostly not mine, thankfully) that had 0.00% of going anywhere but the "Loan Application Declined" bin. 

Which made my tracking for taxes and such all look super dumb because everything is off by a dollar.

Show where their money is received and where it is being held now.A response like this coupled with your inability to issue a refund in dollars makes you sound like a Ponzi scheme that's about to implode on itself.

I bought a house with sec 8 tenants who needed to pay just 200 dollars of the rent.

Even in the Covid era I've found that contractors are still asking top dollar for overhead and profit, making many projects unfeasible. 

A good real estate accountant can save you thousands of dollars by leveraging entity selection and formation, tax deductions, cost segregations, bonus depreciation and tax planning.I recommend finding an accountant who specializes in real estate taxation, business taxation, financial planning and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.