Purchasing a single family condo with lot of equity

[Ran Kim]

I want to buy my parents-in-law condo (worth $460,000) which has been completely paid off.  Any outside of box suggestions on how to acquire this property?  Owner finance will not work because my parents-in-law are as traditional as they come. They only understand cash. Best I can do is perhaps offer less than the listed price, but  I wouldn't be able to finance the deal.