Can my agent contact the Seller to see if they’ll take an offer of $…

As a Buyers’ Agent, I can contact the agent, but I expect she will indicate the advertised price is the price they want. 

As part of the contract we sign with the people we represent, we promise to represent their best interests.  When a Seller advertises a property at a specific price, they indicate that that is the price they want.    To tell parties that inquire that the Seller will take less is to violate that promise.  Furthermore, with corporate Sellers, they often communicate less about such flexibility, unless they are advertising incentives or special considerations (in which case the information is published.)

When you are ready to make an offer, we can write the offer at the price you decide.  If the Sellers counter, that would be an indication of where their bottom line is. 

Negotiating is like playing poker: No one wants to show their cards until the hand is over.