You can't do it in the US as stated, The ICO is irrelevant to what the scheme constitutes, which is a real estate invest fund.

As such real estate investment law applies and the investment scheme needs to be wrapped in a proper legal infrastructure of partnerships. Additionally it is almost guaranteed that you must supply needed disclosure documents, KYC, and a qualified investor questionnaire. You should contact a qualified attorney to determine how this structure needs to be setup, otherwise your going to have problems, and not just with the government. A US citizen can take you to court and sue you personally if you don't take the proper steps to insulate yourself in the means that the law provides. There are certain people who will sue if they know they can win a suit, they can claim you swindled them. They will show the court all the steps you should have taken and didn't. Just things to think about...