perhaps consult with the building management about getting an electrician to put a camlock drop in your studio. Then you could split off and run a few lunchboxes/woodheads wherever you want them. You'll have plenty of overhead as far as amperage and total security about how much is on each circuit, plus reliable breakers at your fingertips. That would also give you freedom to use large lights that draw more than 20A, if you ever need to.
Now a days you don't need to put a camlok drop in your studio to have everything Toby mentions above. Like the loft pictured here where we shot a Bose spot, most commercial spaces have plenty of power, you just need to be able to access it. The first step is to determine the maximum your electrical service has to offer. To determine this look at the main breaker of the service head (main electrical panel.) Commercial wiring is almost always three phase, meaning it has three hot legs that are 120 degree out of phase.
4k & 1.2ks HMI Pars powered from 30A/240V dryer outlet through step-down transformer/distro for Bose still shoot.
A small space would have either 100 or 150A Amps per leg, which means that there would be either 300 or 450 Amps available. While that’s a good amount of power, it is nearly impossible to access it all. The problem is that you can only use the small 120V branch circuits of 15 or 20 Amps. For this reason, you end up not being able to utilize large lights or even a lot of the power that is available at 208V.
One way to utilize larger lights, or more of the available power, is to step-down the available 208V power to 120V with a transformer. Most commercial spaces have 208V circuits for motors, machinery, compressors, electric ranges, electric dryers, and special receptacles installed for Window Air Conditioners. Like it does with the enhanced 7500W/240V output of our Honda EU6500is Generator, a step down transformer will convert the 208V volts supplied by these receptacles to 120 volts in a single circuit that is the sum of two of the phase legs of 30/50 amps each. Now that you have a larger (60A or 100A) 120V circuit, you can operate larger lights, or more smaller lights, than you could otherwise. If you outfit the transformer like the one we manufacture for the Honda EU6500is and EB10000 generators with a bates receptacle you can use standard film style distro like 60/100A Bates Extensions to run power around your studio - breaking out to 20A circuits wherever you want. By giving you access to more "house power" through common 208V outlets, a Transformer/Distro can eliminate the need for dangerous tie-ins or expensive tow generators (use this link for details.)
Guy Holt, Gaffer, ScreenLight & Grip, Lighting & Grip Rental in Boston