Knock, the fast-growing fintech company that makes all homebuyers Power Buyers, announced today the closing of its previously announced $220 million funding round. In addition, the company announced that it has expanded its board, adding Ian Sigalow, Co-Founder and Managing Partner of Greycroft, and David Garland, Managing Partner of Second Century Ventures, the venture capital arm of the National Association of RealtorsⓇ.