How often do you put a place up for rent before you close?

[Amelia G]

How often do you put a place up for rent when under contract but before closing? For example, if your financing requires a one year lease and one of the tenants in a fourplex is month-to-month and doesn't want to sign a lease or is a bad tenant or it is a SFR that is not currently a rental.

Do you find sellers balk at this, either as a contingency that you must succeed in signing a qualified tenant at x price or simply allowing Realtors to show an empty property to prospective tenants?