Building not suited for any high density Environment
Environmental concerns for cooling and humidity
Physical Access Security major concern
Power requirements for high density environment need to be factored in
Routing and Upstream Provider Considerations from a very high level
1. High Density? Our equipment is not gonna be that large...
2. We will have Air Conditioning and we will control humidity.
3. We will have security systems installed (We do need to take care of the company like a bank).
4. Like estimating our energy consumption?
5. That I don't know...
I will just make the suggestion here without even going into all the above, look into sub-leasing colo space and or at minimum a Class A facilities. Factoring Triple Net cost on a building that your hosting customer equipment in requires all the above regardless of how "dense" you may think it is. Otherwise you are just risking pissing off customers because when you relying on "building facility" air they decide to shut it off after hours , or during the winter times they crank up the heat and half your asic's are shutting down because of it.
Lets say you take over a whole floor, I would assume without knowing the local market you would be looking at ballparking it 20k a month just for lease space, not counting triple net. You will then have your buildout cost approx 250k-500k depending on how you negotiate the lease, and assuming the building is up for it also at min a 3 yr lease. So your capex upfront just on space is about 750k plus your buildout cost and or operating equipment, upstream providers, hardware etc etc. I would easily see this being a 2-3mm startup cost adjusted over a 3 yr period, thats on the cheap.
So focus on what your MVP model will be, your fastest to market to start getting customers and scale up from there to prove the model before you jump feet first into what seems to be a foreign market to you. If you go the colo sub-lease route you will save you infrastructure cost and cut your capex down to a pretty manageable MRC cost that you can factor what your customer acquisition cost will be in the long run.
Security systems installed into what, how does that change the fact that you will possibly have machines generating 10k+ dollars on them and there is a plate glass window at ladder height?
Also as far as energy consumption, re my too long post it will help you out with understanding the basics of a very minimal redundancy aspect when it comes to providing a hosting facility.
This can all be accomplished but your going from one aspect of generating bitcoins, to the aspect of customers relying on you who are paying for a service and you have to cover all basis contractually.
Feel free to ping me offline, ill put you in touch with a few resources if your serious about moving forward at least to steer you in the right direction so you dont sink a bunch of time and money into something.