if you want to beat the pressure drop problem, find the backflow for the building NOT THE ONE PAINTED RED, or if it has any electrical conduit on it, don’t mess with that one. (thats for the fire department and the sprinkler system, any pressure drop and the fire dept get a call and you loose a gig)
On the backflow, you will see several weird looking connections that have a gate valve on each of them. You can take a wrench and take off the tapered nipple and you will see a 1/4" female threaded connection you can tie into.
Just go to home depot and grab a 1/4" nipple (its a fag, male to male) then get a reducer from 3/4 garden hose, all the way down to the nipple.
There are 1/4" fittings in the tool section where the orange amflo air hose is stocked. It’ll work just the same as the more expensive stuff in the plumbing and sprinkler section. Mix and match…
as long as the pressure isn’t over 90 you’re good to go. Supposed to be 85 but you can push it to 90.
Don’t go past that or you’ll loose a tank at the least.