The landlord can refer to 20 1 1 the latest famous calligrapher Runge.
Shen Peng per square foot 15000 yuan.
Zhang Hai per square foot 15000 yuan
Ouyang Zhongshi per square foot 12000 yuan.
Xing Fei per square foot 12000 yuan.
Wang Xuezhong per square foot 10000 yuan. ...
It can be seen that famous calligraphers are all at this level. So it's impossible to say hundreds of dollars upstairs.
According to my personal understanding, teacher Zhang Laisheng's runge should be in11000-13000/square foot, but each original cursive script is different and cannot be generalized. Among them, "original", that is, regular script required by the landlord, should be the most expensive. I conservatively estimate that Mr. Zhang Laisheng's calligraphy is 13000 ... but he was famous for his cursive script in his early years, and it's hard to find his name, so it's not necessarily necessary to have money. Good luck to the landlord.
I typed word by word and looked up information myself, hoping to take my advice.