Last year, Natalie Zamani and some of her California friends visited New York for a few months while working remotely. “We had so much fun,” said Ms. Zamani, 30, a senior software engineer, who had been living and working in San Francisco.

Through Zillow, she found Jeff Gordon, a licensed salesman at Platinum Properties. “I was unfamiliar with the ins and outs of New York real estate,” Ms. Zamani said. “Jeff was understanding of what I was looking for and sent me amazing listings I couldn’t find myself.”

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