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BiffCo Enterprises, or simply BiffCo, was the enterprise founded by Biff Tannen after having made millions successfully betting on horse races with help of the Grays Sports Almanac in the Biffhorrific timeline. He invested in toxic waste reclamation and other heavy polluting industries with the company. Biff's position in the company gave him great influence over political leaders and law enforcement.
BiffCo Realty, a part of BiffCo Enterprises, owned Lyon Estates. In 1985, a line at the foot of each lion statue at the entrance (albeit partly obscured by graffiti) said that Lyon Estates was a PROUD MEMBER OF THE BiffCo FAMILY.
On October 26, 1985, Doc Brown sneaked into the Hill Valley Public Library, which had been boarded up and closed down to make room for a new BiffCo development. He learned about this timeline through the Hill Valley Telegraph archives, and took some bound collections of newspapers containing the relevant information back to his now trashed lab, where he showed them to Marty McFly.
When they retrieved the almanac from Biff on November 12, 1955, Marty burned it with the matchbook he took from the Pleasure Paradise. He realized that the timeline had been restored, and the BiffCo properties were erased from existence when the text on the matchbook's cover changed before his eyes from PLEASURE PARADISE to AUTO DETAILING.