A lease agreement with an option to purchase cannot be written by a Realtor. Only an attorney or the actual owner and lessee/optionee can write such an agreement. Because the law is complex in this area, it does require legal expertise to write a contract like that.
Normally, when an agreement is reached, it is difficult for only one party to change the agreement without the other party's consent. But there are exceptions.
You will need to take your lease agreement and take it to local lawyer. If you are using a realtor, check with him/her as well! There is a hot line for TREC that your realtor will have access to.
JP and Associate
Hope this helps!
Ali, Community Manager