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Buying real estate with cash
If they really want cash, you notify your bank in advance of the amount and have it put in your account, then you both sign the paperwork at the bank and after everything is signed you have the bank hand them the money. Guarding it after that is entirely their problem. Personally, I would consider this a stupid request and tell them to have their lawyer discuss it with my lawyer in the hope they can be talked out of it.  As far as where to get the money: Same as for any purchase, find a bank willing to write a mortgage for you on this new house. What you choose to do about the other two houses is an independent question. You can sell one or both, but that may take money so you probably won't finish doing so before needing to pay for the new house. Of course when they do sell you can use the money toward paying down/paying off the new mortgage.