A team of AI researchers spent years analyzing hundreds of thousands of apartment leasing conversations to find out what actually makes agents close deals — and the answer had nothing to do with scripts, product knowledge, or response time. The single strongest predictor of a signed lease was whether the agent made the prospect laugh. Grotto AI built a platform around that finding, and the results are already showing up on the balance sheets of some of the country’s largest apartment operators. Here’s what they learned, and why it changes how multifamily teams should think about where AI belongs in the leasing process.