I was paid by my landlord to move out of my apartment, I did not receive any tax form from her for this taxable income. How do I report this taxable income?

The building that I was living in was sold by my landlord, as part of our agreement for myself moving out early (to terminate the lease) I was paid a certain amount when the building was sold and closed. I never got a tax form to properly report this income, but I sent the landlord a W9 to capture my taxable income. How do I report this income?