KeyBanc analyst Brandon Nispel said that 5%-10% pullbacks in the tower REITS space are historically "ideal times" to build positions and he doesn't see any reason why this time is different given his view that fundamental valuation drivers remain intact. He would be a buyer of American Tower (AMT) and SBA Communications (SBAC) shares, especially if the stocks in the group sell off if Crown Castle (CCI) disappoints with its 2020 guidance next week, Nispel tells investors. He has Overweight ratings on American Tower and SBA and a Sector Weight rating on Crown Castle.