Honestly man, that is an enormous kind of project. There are very few people that actually have experience running things at such a large scale because it's a lot more difficult than it sounds. Proper cooling/venting for a warehouse that size is an entirely different ball game to a mid-sized operation. A warehouse grow isn't something that you can exactly find a step by step process for like growing in a tent.
It all depends entirely on your situation because pretty much everyone's varies. I'm not trying to be an ass and please don't take this the wrong way, but if you can't figure out how to even start/optimize a large scale operation you should avoid it entirely and just start smaller. Many people make the mistake of going too big, and when things go wrong it's on a much larger scale. Knew a guy that had a system with 90 plants, some of the greatest quality herb I've had the pleasure of getting my hands on. But then he expanded to a 500 plant operation. He wasn't getting the same results that he was before with 90, but because he had a 500 plant operation that meant the monthly costs were much higher than normal. He didn't make it more than a year.
If you guys don't take the time to spend days upon weeks to plan things out and do your due diligence then you could end up wasting a good opportunity. I would start smaller and then gradually work your way up to the warehouse grow, you could even do multiple grows in separate smaller locations to cover the same amount of square footage. Again, not trying to be an asshole and rain on your parade, but if you guys can't figure out a business plan before getting things started then you have a much higher risk for failure. McDonalds didn't start with hundreds of restaurants at a time, and Coca Cola didn't begin nationwide production when they first started either, they all started small and used the proceeds of their success to expand.
You have an amazing opportunity in front of you though, take the extra time to plan out every single last detail and make a name for yourselves in the meantime. Then, once you've gained a reputation and more capital you can get your warehouse grow going much easier. Wishing you the best my man, now get yourself a pen and a notebook and start planning