Per Classic Stage Company, 301 is an accessible seat not a wheelchair seat.
I bought in the rush when tickets first went on sale and - as several posters noted here - information about these seats were not listed. As such, I checked with the box office and they confirmed it is a regularly purchased seat anyone can use, it is just available as 'accessible' if that is your need.
Hope that makes sense! Feel free to confirm with box office. The only reason I am selling is because I have 2 seats for the performance the night before and no longer need this one ticket on 1/8.