I'll give it a shot...
Top group of cb's:
Two (2) on left side are OCP for 'Center' and 'Lower' sections.
Three (3) on right side are 240/208 volt circuits.
Also that complies with 'the six-switch rule' (NO main)
As I don't see a ground bar...this must be a 'main panel'
Center group of breakers appear to be 'small amperage loads.
Lower group are all 120 volt loads. The 'red' marked probably indicates 'exit/egress circuit', or perhaps alarm/smokes.
Just guesses!
