Buffalo's Gateway to Niagara's Renewable Energy - Energy Con

I have a friend who owns the building in Buffalo that served as a terminal for the import of Niagara Falls renewable energy to Buffalo in 1896. Given the history of the structure, he wishes to restore it as much as possible to its original appearance. He then wants to make it a cathedral to renewable energy.
One scenario is to transform the building into office space. My gut reaction is that the 27,000 feet of space totally dedicated to electric energy use on four floors would equal a peak load of around 50 kW - three phase. This is my real question - is this a reasonable estimate?
My friend's current concept for the property on the shore of Lake Erie is to maximize the capability of at least one wind turbine and as much surface area that can be dedicated to a photovoltaic array.
New York does not appear to allow net metering for loads in excess of 10 kW and only for residential customers. If this is an incorrect assumption, please let us know.
Assuming that net metering is not an option and that any excess energy has almost no value as a result, then the installation of a hydrogen electrolyzer becomes worthy of consideration. If this is the case:
1. Can the electrolyzer run effectively in the load following mode where the energy in is only is equal to the minute by minute energy surplus of the building?
2. What are the detriments of using the electrolyzer?
3. Please provide any other comments.
Regards,
John Phillips