You should easily be able to obtain these seats from the box office. Although it is much better to get seats in the mezzanine via TKTS, the balcony is fine. You can see everything despite a few head cutoffs Act 2 (Entering Grey Gardens, Choose To Be Happy), but as long as you sit forward in your chair you will be able to see fine.
...What happened next, was stranger still, a woman breathless and afraid, appeared out of the night, completely dressed in white. She had a secret she would tell, of one who had mistreated her. Her face and frightened gaze, my mind cannot erase...But then she ran from view. She looked so much like you...