Happi_man,
Like to help but too many unknowns here. Is the service or sub-feed existing? What type of light fixtures will be installed? How many devices? (plugs, switches) Is this a large retail chain going in? (a number of them will supply there own fixtures) Are you required to install wiring for a sound system or sensormatic? Do the plans call for MC, EMT or...?
This is what I would call a tennant improvement. Which brings me to my next important question from past experience. Is the contractor a local who pays on time? Or, some "Fast talkin Hotshot" who travels all over the country and takes over 90 days to pay? Be careful if this is the case. The tennant in the store is usually little help when trying to collect from the contractor whom he already paid.
I have seen too many subs get burned by these guys.
Wirewiz