Realogy stock surged more than 25% in Tuesday’s premarket after it announced a deal with Amazon. The largest residential real estate brokerage company in the nation is partnering with the largest online retailer in the world in a strategy designed to boost sales for both. Realogy and Amazon will now offer TurnKey, a program that takes potential homebuyers through the Amazon portal and connects them to a Realogy agent. Once they purchase a home, they then get complimentary Amazon Home Services and products worth up to $5,000. Realogy, which owns such brands as Coldwell Banker, Century 21, Sotheby’s International Realty,...