Crown Castle built a 5G-capable, private wireless network, built on open RAN specifications inside a New York City skyscraper at 345 Park Avenue. The network operates in the unlicensed 3.5GHz CBRS spectrum band and is initially being used for "smart building" operations, including tracking indoor air quality, tenant traffic and elevator wait times. In a Crown Castle release, Michael Rudin of the Rudin Management Company stated, “The spectrum that this technology is based in is the wave of the future, and tenants and owners alike who rely on fast, reliable connectivity will need this in order to stay competitive.”