PM agreement before closing?

[Chase Gu]

Hi - Thanks everyone who responded to my questions about PM in Richmond. I have a property under contract and has not yet closed yet. I received a management agreement from a PM. My question is whether I should sign any contract with PM at this stage (I want to make sure a PM is ready as soon as the property is closed). Of course the contract will have some language saying the agreement is cancelled if the deal falls through. Do you sign something like that before closing? If so, do you have any standard language for pending on closing? 

Thanks!