74M is 300' and according to MEPA these will be 290' - that said it looks like the mechanical penthouses aren't included so these might be around 320'-330'.
https://eeaonline.eea.state.ma.us/EEA/MEPA-eMonitor/submittal/56D2411B-92B0-4091-A5F0-ACABB0E90D1B