Knock has raised more cash to grow its real estate CRM and communications platform.

The Seattle startup just brought in another $2 million from real estate owners and property managers who also use the company’s service. Total funding to date is $5.5 million.

Knock builds technology that facilitates communication between multi-family property managers and renters — responding to questions, organizing tours, etc. It bills itself as an OpenTable or ZocDoc for property managers, consolidating chatbots, text messages, voicemails, and more in one place.

Knock’s product can be used with property management software systems like Yardi and Realpage, and also provides back-end analytics data to highlight engagement and internal sales statistics. It also integrates with productivity apps like Outlook and Slack.

Knock is one of many tech-focused real estate companies in the Seattle area, ranging from giants like Zillow and Redfin to smaller startups like JetClosing and Estately.

Originally called ZipDigs, the 25-person company was co-founded in 2014 by Tom Petry and Demetri Themelis, who previously worked together at UBS Wealth Management. Jay Zeng is the company’s other co-founder.

Knock recently hired Ted Ellis, former CTO at A Place For Mom, to lead its technical operations.

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