Guys and Gals, I have a client that is building a large warehouse in a commercial district in TN. His building will be inches from the neighboring building and he is concerned about how to finish the exterior wall "adjacent" to the neighbor. If anyone has any experience with close quarter building in ICFs please give suggestions! I considered panelizing sections of the ICF walls, putting peal and stick membrane or spraying the exterior with some sort of protectant. FIRE AWAY GUYS!!!

What is close? 1inch or 1 foot? What is it next to?

You could consider prefabricating this wall, complete with rebar and exterior finish then moving it into place. Simply tie the pre-fab wall to the corners and build the remainder of the structure as normal.

Just pray for no blow-outs on the outside!!!

FBBP is asking the right questions. I've had two similar situations. In one, the code official agreed that since the neighbor was brick and distance was two inches he would allow us to treat it like a brick air cavity and we didn't have to do anything but pour it. Two pours 15' each.

On another one we were a little further away and the GC (no code official this time) required us to put add an external Demsglass (spelling not correct) and so we screwed it to the Nudura. Believe it or not this isn't as painful as it sounds because you can take 3 inch screws and attach a full sheet by screwing from the inside of the block through the form and into the material. Regards.

We have parged as we have built, waterproofed as we have built, and had a mason stacking block as we built all prior to pour. It's not ideal or quick, but it worked and you do what you have to do and price the project accordingly

I am talking less than a foot, not enough space for a man to get in there. I think panelizing or just building the whole wall and setting it in place is the thing to do.

and it is next to a block building

I would think that parge coating the foam as you stack it with surface bonding cement would be about as quick as anything and provide sufficient protection for the foam long term.

I think you are on the right track with the panelized approach.
Would suggest that you consider magnesium oxide board adhered to the exterior....fireproof, durable, inexpensive, but very heavy.

Call Magnum Building Products in Florida, a good importer of MgO board.
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