I hate the idea that EA is trying to force or trick us into playing the multiplayer portion of this game. At the very end of the New York part of the game as soon as you pull up to the entrance of Carmine Rosato's compoound a message appears telling you you need to go out and recruit a made man that is an EXPERT with demolitions in order to be able to blow up the building! WRONG! First according to the Prima game guide there are no EXPERT level demo men that you can recruit in New York. But if I understand how the multiplayer works you can play as any of your made guys online as a way to increase their skills.
Second I was able to blow up the compound with the Demolitions guy I had with no problem who was only rated as advanced with demolitions.
You need to take over or bomb all rackets of a family in order to unlock their compound.