Worth a Fight or Time to Let It Go? Parking on an empty residential lot

The quick story is that the St. Louis College of Health Careers located immediately south of I-64 on Taylor Avenue, within sight of Barnes-Jewish Hospital, owns a grass lot one lot away from their building and parking. In 2009 they asked for neighborhood support to demolish the four-family building between the two in order to gain 18 parking spaces. The neighborhood development committee (on which I serve) said "no".

Since then, the grass lot has turned into an impromptu parking lot when the main lot is full. I have reported this non-conforming use to the St. Louis Citizens Service Bureau twice now, receiving confirmation that the lot owner (COHC) has been cited.