Apartment List

Apartment List is an online marketplace for apartment listings. As of January 2018, Apartment List had over 4 million units on its platform. 
History.
The co-founders, John Kobs and Chris Erickson, launched Apartment List in September 2011 at TechCrunch Disrupt. They created the company after having negative experiences as both renters and landlords. 
In November 2013, the company's first round of funding raised $23 million, with lead investor Matrix Partners. Another round of funding raised $50 million with Passport Capital in November 2017. 
In late 2017, Apartment List partnered with Facebook Marketplace, Homes.com, and Realtor.com. 
Business Model.
Large, professionally-managed properties are charged a variable fee to use its service. Landlords and building managers are connected to potential renters and pay a fee when a renter has moved into their property.