I do not know your area specifically. Normally a tenant pays first, last, and a damage deposit. On lease it is customary in my area for the tenant to pay the commission to the Realtors with cashier's checks that are deducted from the total.
For example, if the rent is $2,000 a month, a one lease is $24,000. If the property was listed at a 6% commssion, each Realtor receives 3%, or $720 each, $1,440 total. So the tenant total deposit is $6,000, less the $1,440, the remainder $4,560 would be in the form os a check issued to you, the landlord.
Your area may have different customs, I would suggest reviewing the contract. Certainly if you have questions ask your Realtor, if they do not have answers ask their broker. If you have additional questions .
1) The option money agreement. Normally non refundable or goes towards a downpayment on the property.
2) The lease agreement. Should be drawn up by an attorney. There are a lot of pitfalls for the landlord.
3) The purchase contract a FAR or FAR/BAR contract
These deals are complicated and usually needs another document to tie the 3 docs together, an attorney matter. In your case, if it was the option money, you should keep it minus ev commission.
Most lease-option contracts provide that the option consideration (both the upfront amount and any monthly amount credited) is nonrefundable if the tenant-buyer does not exercise the option. Judging from your question and reference to "non refundable money," it sounds as if the contract specifies that such funds were nonrefundable.
If that's the case, then no, the seller does not receive back a portion of his/her nonrefundable option fee.
You may, if you wish, voluntarily return some of the money. That's sometimes done, though rarely. But, if the contract states that the option fees are nonrefundable, then that's just what they are.
Hope that helps.