yeh I remember the building of the N11 QBC being held up for a while because the portuguese (?) embassy wouldn't let their land be used. And you can't CPO land belonging to another state. So they have the capacity to be a real problem.
And yeh taller buildings in the area pre-date rampant loony American paranoia. However, i firmly believe Sean Dunne is not daft enough to let this become an issue. I'd speculate confidently that this has already been sorted out. His people know the deal. I thought about this the day he bought the site, so I presume he did before hand. I have been in the US Embassy (also bear in mind the Israeli one is at the same junction as Jurys in Carrisbrook House) and it's nothing spectacular. It has been around a while and may even be obsolete as an office block as most offices of it's era are. I wouldn't be surprised if they took a new Embassy building somewhere else if they couldn't live next to a 37 storey building.
http://ireland.archiseek.com/buildings_ ... bassy.html