Realtor commission???

[Patricia K.]

I have a rental property that I listed with a realtor over a year ago; currently there are tenants with another year on the current lease. Within the rental agreement is a clause saying that if a sale results from the lease, the realtors are entitled to 6% commission. My question is, does that commission hold after the original lease is complete? If my renters decide they want to stay after the original term, and I don't use a realtor to draw up the second lease, would I still have to pay commission to the realtors if they ended up buying the house 4 years later? I've not had to worry about this before but the property is in another state and I had to list with realtors to find tenants...