Requiring Seller to Cease Marketing After Signed LOI?

[Kim Hopkins]

Hello!

I was considering adding to our LOI template a requirement that the seller cease marketing the property, including on any real estate websites (broker website, CREXI, Loopnet, etc) once the LOI is signed.

I've never done this before, but I was wondering if anyone else has and if it sounds reasonable? I don't want offers coming in while we're trying to negotiate a contract. 

Thank you,
Kim