An earlier version of the $650 billion tax break bill detailed Wednesday included provisions that would have potentially derailed major company deals that involve REITs, which have gained popularity among investors thanks to more favorable tax treatment. In the latest version, companies are exempt if by Dec. 7 they had requested that the Internal Revenue Service interpret and apply tax laws to their transactions, according to Senate Democratic leader Harry Reid’s office, which backed the changes. The changes protect the operating unit of Caesars, which has filed for bankruptcy.