Why do you only focus on residential PMS's? From my perspective, I think commercial property management would have a larger opportunity to leverage APIs for market analytics, pro formas analysis using KPIs talked about in earlier parts of this thread, and DD (historically one of the biggest pain points for RE).

Credentials: Sr Product Manager at Amazon in the RE Team (Amazon Fulfillment), former BTS commercial property developer, and current luxury residential Real Estate agent with MLS access.