Too many variables are involved.
The regulatory burden does not make it an inexpensive proposition either.
Also too it matters how much of the process you plan to take on. Some things are not cost effective.
For that reason, many companies just strip the systems to a certain point, process the boards to a certain point, and some items are left as an assembly. If you plan to deconstruct to the bare boards- forget it. You labor costs and mitigation costs will cost you more than you will take iin.
However, If you deconstruct only to boards, wire, drives, and removable pieces, which is what most profitable companies do, not counting permitting or other regulatory burden, you can accomplish that in a slab on grade building as small as 1200 square feet, so whatever 2 to5 Acres cost, permits in your state, the cost of the building with insulation and heating and cooling, as well as restrooms, etc, that is your basic startup cost without employees. Employees are expensive and you would need at 1 experienced in deconstruction of equipment who knows what the are looking at.. This is not including storage equipment, material handling, and consumables.
You can also process other consumer electronics as well. Storage becomes and issue after a while as well- which is why plastic will be a big problem for you.
Unless you have a buyer lined up for plastics, get used to landfilling it.
http://www.wastenews.com
http://www.resourcerecyclingmagazine.com