I'll stop, but consideration depends on the type of contract, unilateral or bi-lateral as to the obligations of the parties.

It's a bilateral contract, and if expectations of representation are continued to not be met, you have every right and should cancel.

I'm a fitness addict and bilateral amputee!

@David Burton I'm not sure what is meant in your comment about an "optional contract", but your lawyer should understand the use of a straight purchase option contract.Perhaps his objection to the use of a modified P&S contract is that it is fundamentally a bilateral agreement (i.e., both parties are required to perform).A straight purchase option contract, however, is specifically designed to be a unilateral agreement (i.e., only one party -- in this case the seller -- is required to perform). 

Even if you include a clause in your lease to allow this, courts have ruled that a bilateral contract that can be terminated by one party is not binding and can be terminated by either party.

Even the Italian started buying Russian oil.2. shifting from unipolar world to multipolar world, country buy other country product with local currency using bilateral agreement to avoid using US Dollar.3.

I was told somewhere that it is bilateral.

There are plenty of faces that pop up on this forum a lot that say a whole lot of nothing as well.I would say I respect the posters who have a range of experience, have actually done a lot of deals, and also have bilateral opinions that see what may be legitimate and illegitimate about both sides of a topic tend to earn my respect. 

@Luis Serrano hey I reside in NC and would like to know about the bilateral contract you need for each wholesale real estate transaction?