Crown Castle (NYSE:CCI) agreed to acquire a portfolio of ground-lease related assets from Wireless Capital Partners in a deal valued at $180 million in cash and the assumption of $320 million in debt.The portfolio includes 2300 ground lease related assets, including over 150 related to CCI towers.The assets generate annual cash flow of $42 million, with 80% generated from big four carriers.The deal is expected to close in the first quarter.