Mold Problem / Buying a House
1.
If there was a mold problem in the apartment, Ethan Hawke's character could legally break the lease and find a new apartment to rent...especially if the doctor confirmed that there was a mold problem in the apartment.
2.
How is Ethan Hawke's character going to buy a house directly with cash? In order to buy a real estate, the process usually needs to be conducted by an escrow company or title insurance company first. Or at the very least the title transfer must be recorded in a government office. How is he going to explain to everyone that he is just going to pay cash? Especially with blood on lots of the cash? Furthermore, if he deposits all of the cash in a bank first, government agencies will be alerted, because they usually get tipped off by the banks for large transactions. Ethan Hawke doesn't have any front business to launder the cash.