According to the auction transaction of Mr. Aisingiorro's calligraphy in the second half of this year, the vast majority of them are 2000 yuan (RMB)/square foot on average (some transactions are very high, there must be other reasons);
Among them, the following may be similar to your situation for your reference:
Zhongan Taiping (Beijing), 2007-09-14,37 * 46.5cm, 2200 yuan (RMB).