Do I have to accept cash as an option for rent?

Question Details: I have my tenants on month-to-month leases. I have in the past picked-up rent payments. I will be moving out of state and managing the properties remotely and have set up my tenants to use either a third-party online payment method or bank transfers. However, one tenant is resistant and claims that it is illegal to not accept her cash or check payments. She refuses to use online or her bank. We are updating our leases to the new payment methods only and have informed her that she doesn't need to renew her lease if she chooses not to. She threatened to take legal action, however I feel we've offered her multiple ways to pay, but can not physically be available to pick-up payments. We also can not justify the need for a PO Box for just one tenant and do not want to give out our personal address for payments.

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