If you are willing to pay for the install of all connecting cabling you essentially have an 'off the grid' system and you can do it however your electrician wants, really. In this case you *should* always be able to utilize your own solar generation to offset your own immediate electrical demand, but not your overall aggregate usage. You will need to install utility approved metering equipment that can track and coordinate this behavior with your installed inverter units. It's always when you want to feed back into the grid and negotiate aggregate usage that things get dicey.
Constant or controllable loads like lighting, hot water heating, and maybe dryers would do well with solar, very large variable loads like elevators not so much and might still draw significant power from the grid if you don't have any local storage capability to handle the short-term power draw.
If you want to feed thru existing utility wire to get to/from destinations that will be a lot more difficult and require various agreement(s).
From such a project of your size you are probably best off asking/talking to existing vendors, I know there are decent amount of large companies installing on-roof solar these days and they have to be hiring someone else to do it, most don't have this kind of expertise in-house.
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