If your head grower cannot address this issue for you, then you need a new head grower...
This site caters to individuals trying to better their own cannabis gardens I highly doubt your going to find someone here to do a business plan for you free of charge. If I may be so bold... it's companies like the one you describe that are ruining the industry. And the reason I state that opinion isn't because I'm sour or being undercut or whatever. Rather that if you are building something for someone else with your specs or really lack of, and you had past grow experience you'd think you'd want your tenenants/experienced head growers to be able use their past experience to optimize the space for their vision not yours. especially when you think of how many different types of equipment and grow style and individual needs vary so greatly.
In short your post comes across as someone who without the required experience is just trying to make some premium priced rent at the expense of a mom and pop grower but I don't know, all is fair though and hopefully it works out for you.
I apologize for any confusion, I'm not asking anyone to write a biz plan for me. I am savvy enough to know that marijuana set ups are much different for larger/commercial sized grows opposed to smaller indoor grows. I will also most definitely have the head grower spec out the building to their liking. However, before I jump in to this head first I was simply trying to have a rough idea of what would go in a 20K square ft grow facility. (So that I may estimate the cost per square foot)
My experience as a grower was only in a 1K Sq ft place where I had 40 plants on
perpetual harvest. Set up was a room for my two mothers and clones, a veg room and then my flower room. My medium was 6 inch cubes set to flood and drain. Lights were tricky as I started with led but resorted back to HPS after I wasn't satisfied with the results of led's (this was a few years back...led has come quite far since then). One large carbon filter is all that was required with some 6" ducting and a few fans.
So again, I'm just trying to get a rough idea as to how to appropriately outfit a commercial grow facility of the aforementioned magnitude.
As for mom and pop grows and those willing to up their game, they stand to make a pretty penny along the way as well with facilities such as this one. I'm confident that anyone in the industry and growing beyond their personal use are looking to make a profit. In fact, there are several articles all over the web supporting that statement.
I suppose I just figured I'd throw out an honest inquiry to gain a bit more insight regarding a commercial grow facility. Thanks for all your help.
