Thanks Cyknight
I inherited everything except the modem which I just had installed and everything seems to be working. There's a Lulu Epic 5 router, a TP-LInk EAP225 wireless gateway and a Araknis PoE switch. Seems like a bit overkill for a 2 bedroom apartment:) No plans on replacing those at this point.
As for wifi devices, not exactly sure yet what devices are running via wifi. Using Fing (I THINK fing only shows wifi devices) I see maybe 20 devices including AV receivers (hardwired to rooms and ethernet but maybe showing up for Airplay?), Sonance channel amps (not sure why on wifi), AppleTVs (hardwired in rack but probably has wifi enabled), a thermostat for a heated bathroom floor, a Control4 8x8 HDMI Matrix Switch (guessing since I see 8x8-ams.lan in fing) and others I can't identify. As well as four control4 panels.
I do have an inventory list the owner gave me which is helpful (as well as the creds for the router, gateway and switch)
Sounding like I might have an issue if I do figure out how to change the wifi pw on this wireless gateway. Updating the pw for AV and panels might be straight forward but there's things here I don't know yet how to get to an interface, plus other devices I can't yet identify. My main concern is the weak wifi pw and just simply changing the previous owner pw.