SAN FRANCISCO--(BUSINESS WIRE)--Opendoor, the nation’s fastest-growing online real estate marketplace — which is radically simplifying the way people buy and sell homes — today announced a $400M investment from the SoftBank Vision Fund. The company also announced it has secured access to more than $2B in debt financing from top banks. As it rapidly expands to new markets across the U.S., Opendoor will use the funds to accelerate development of the first technology platform to make it easier to.