Offer contract on a duplex that is vacant

[Brian Deal]

I may be making an offer on a rental property (duplex) that was recently rehabbed and therefore, has not yet been rented.  Has anyone made an offer with the stipulation that would allow for the marketing of the units PRIOR to the closing date?  I.e. I don't want to wait until after the closing to market the units, and ideally would have the units occupied shortly after the closing. 

Thanks!