The Sahara closed two of its three hotel towers for the winter season because of low demand, but the casino and other amentities will remain open, a property spokeswoman confirmed. “Two towers of the Sahara Hotel will remain dark based on demand through the holiday winter,” an e-mail statement said late Monday. “Upon further demand, Sahara Hotel will make more rooms available.” ............................................... Binion’s Gambling Hall & Hotel downtown closed all of its hotel rooms Monday and cut 100 positions. The downtown casino company also blamed the decline in visitor traffic and revenues for the closing.