Can I market a home BEFORE I have the signed contract?

[Markeilsha R.]

okay here's the deal.... I have been dealing with this REO agent on a home in Middletown, NY, and I finally got the contract for that signed etc. While I was checking out her listings I found another home they are selling in Yonkers. I spoke to her about getting the contract for that and she said they wouldn't until Monday, since the office is moving and won't be up again till then. Is there anything that would prevent me (legally) from beginning a bit of marketing for the second property? Do I have to wait until I have the property contract in hand?