Final answer:
A lease provision requiring tenants to waive their right to interest on the security deposit, despite this being required by law, is generally unenforceable and considered invalid. Tenants retain their legal rights to such interest.
Step-by-step explanation:
The provision in question, where a couple has signed a lease waiving their right to the interest earned from the security deposit, even though it's required by law, is likely unenforceable. Lease agreements must comply with state laws, and many states have specific statutes that entitle tenants to interest on their security deposits. If a lease includes a clause that contradicts mandatory legal provisions, such as the right to interest on a security deposit, that particular clause is typically considered invalid. The rest of the lease may remain valid, but tenants would still be entitled to the interest as prescribed by law. It's important for tenants to understand their rights and for landlords to provide leases that comply with legal requirements.