https://www.bizbuysell.com/motels-for-sale is a good site that could help you to sell your motel. When listing there don't forget to indicate that BTC is accepted. The other option is to put right "for Sale" banner right  at the  frontage of Route 66. BtW, you can sell for $ and buy BTC after selling. If I were you, I would use motel to earn BTC rather to sell it.