Airbnb Adds Hotels and Luxury Listings to Bolster Growth

SAN FRANCISCO—Airbnb Inc., looking to solidify sales ahead of an initial public offering expected as soon as next year, is adding more hotels to its site, along with a loyalty program and new tiers of listings that include luxury and more budget-friendly offerings.

The home-rental site, valued by investors at $31 billion, announced the changes at an event here on Thursday featuring Chief Executive Brian Chesky and hundreds of hosts. Airbnb also said it would begin certifying some homes with a service called Plus that will...