Is there any other recourse I can take against the buyer to recoup any costs or decrease in eventual sale price?

We may have slightly decreased the value by opening up a wall to convert to a one bedroom but our purchase price allowed us to do this without losing much equity.

I would think it would either do nothing (too much losses already and I am not a real estate professional), OR decrease tax owed.

Here's the first post, admittedly written quickly: - SBA guaranteed- Renters or owners can request loans- For people who are affected by C19 virus and consequent economic disruption: - Needs a standardized and easy loan process; RENTERS: people bring in their credit rating, proof of rental payments, notice of layoffs or decreased income from job

https://www.nydailynews.com/coronavirus/ny-coronavirus-senator-gianaris-calls-for-rent-suspension-new-yorkers-20200319-unw3kcrtbnhvbnvkvymskhjdv4-story.htmlI'm not sure what to say other than a 25% decrease in annual revenue (and three months without any) would be catastrophic for almost everyone I know in the business. 

Bad public policy to decrease value of an investment while the debt increases. 

Now I am not huge fan of buyback either, but they are not as evil as everyone makes them out to be...they decrease the share count which means me as shareholder I own more of the company. 

If I do not buy down the loan, I do not receive the increased cashflow of $700/mo from reducing the mortgage expenses over the lifetime of the loanI’ll go pull some of the numbers to show my decreased interest over the three year span and follow up.

Note if you refinance them, your cash flow situation is likely going to be about where it was prior to the value add but your equity has increased and what you have actually invested has decreased. 

I do know, as a land investor, that more of us who buy and sell vacant land are avoiding "buildable lots" or "infill" lots because new construction generally decreases in a downturn, and therefore the demand for land which can only be used for a spec home decreases and is hard to sell.