The 1099-S you received at closing reflects the full sales price because it's reporting the total amount received from the sale before any specific deductions or payments.For tax purposes, you would need to consider the net proceeds from the sale.

But I have specific questions about the steps that I can’t find the answers to.

This is standard for ACH so this is not specific to Buildium as you could encounter this with any ACH payment if the tenant lies and says it was not authorized. 

@Carlos Hidalgo for specific questions on your individual market it's best to connect with other investors/experts in your area.  

Alternatively, you can source other financing like HELOC from your primary or private funding.

Alternately you could do the vinyl at your convenience.   

Best of luck on your house hacking journey, and feel free to reach out if you have any specific questions or need further guidance!

They specifically said do not have tenants write checks to your personal name incase of lawsuits. 

My intentions are to help others learn research steps, not to single out a specific owner or property. 

This last questions sounds area specific.