As Dmitriy pointed out, the IRS isn't very good about missed deadlines -- if you don't get the money back into your IRA within 60 days, it will be considered a distribution and you'll owe taxes and penalties. 

The Foreclosure Process-The foreclosure process is pretty straightforward: The bank or lender hires a trustee to represent their interest and the trustee has to file specific documents with the county circuit court, and the homeowner has certain deadlines to contest the filings filed by the trustee.

They will be somewhat familiar with the type of purchase agreement used and will be more understanding of the deadlines etc.

I'm not saying you should just ignore them, but I have personally had at least 3 instances where I was given a deadline for repairs on a new purchase by the insurance company, and they never cancelled, asked for photos or reinspected.

You must structure the sales so that the new purchase can meet the 45 and 180 day deadline for each of the sales. 

The repayment terms for a 401k participant loan are equal monthly/quarterly payments of principal and interest (typically prime plus 1%) over a 5 year term (longer if used to acquire your principal residence).Please note that if you take a full $50,000 and then pay back the loan, you can't take another $50,000 until 12 months after the first loan was fully paid back.Per the loan offset rules that went into effect with the 2018 Tax and Job Act: if you leave your job and the loan is current at the time you leave your job but then the loan goes into default because you left your job, you will have until your tax return deadline (including any timely filed extension) to make the loan current by depositing the outstanding balance into an IRA (and thereby avoid the taxes and penalties that would otherwise apply).

If you are in a tight deadline, Amazon and Wayfair are good resources with decent selections.

They were moving too slowly for our deadlines so we went to another bank to see how quickly they could close the deal and they offered 8.25% for a 5 year shorter term amortization which would have cut our cash flow by $800/month.

At this point I would pay what the tenant is asking and take this as a learning lesson for future tenants to make sure that you meet the deadlines.

Unless it is a really good deal and you can't find any others, I'd give them a deadline.