Scott Baron

How do I sell part of the land I donated to nightrider group. I own 31280 land. I donated it to Nightrider group. I want to sell 14384. its all group owned. I cant delete the group because my alts own things there. One officer has left SL and I cannot eject her. I cant post the land for sale and buy it because it will raise my tier???. Its my land. I dont know what to do. Please help