Ally
Read your listing agreement. If it is unclear or you are not certain of what a clause means ask a qualified attorney to review with you.
Generally speaking you have agreed to offer your property for sale. You have not committed to sell. There are numerous terms in a contract that must be agreed to by both parties. Price is not the only component nor is it the DETERMINING component. You can negotiate into any contract terms you want... if the other side does not agree to those terms then there is no contract and therefore no commitment. (Most governing statutes will require the parties to act as "reasonable parties" or if they fail to do so... then to be judged by the "reasonable party standard".
An attorney can advise you how to counter an offer by a party that intends to use the property in a way you do not wish the property to be used...
In other words.. you can add a covenant to the contract stipulating the property must be retained in it's present state, zoning etc... Or you can retain rights to prevent certain future developments....
A local property was transferred to the railroad to be used only as a landscape buffer. IF the railroad ever built anything on the property, then the property reverted to the prior owner. This actually stopped the railroad when they decided they wanted to move the town train depot to this property... The property has remained vacant.
AGAIN, consult a qualified attorney.