the exact size of the land -- groups are allowed to be negative in tier for short periods. then you set the land for sale, directly to you, for l$0 and you buy it. then you set it for sale to anyone for whatever amount you want. note that if you are using the full amount of the 10% bonus that the group gets, pulling out enough tier to sell it to yourself could result in the group not having enough even after you sell the plot to yourself. this is why it is sometimes better to just leave the land in the group and sell it straight from there.
thanks 