But, they do not really sell it for bitcoin, because Bitpay will convert bitcoin into fiat currency and give it to Asto plaza devs.
But its a start. At least we are witnessing the the beginning of BTC crawling its way to the mainstream market places. I could also envision that BTC can used in auctions of valuable items for collectors. The sellers could be paid directly without the need for a middle man to handle the payment.
Given that there is an upcoming expo 2020 in Dubai where businessmen around the world will meet, this is a good exposure of bitcoin because it can possibly attract more investors. Though the price is given in bitcoin but still there's a fixed value peg in dollars so the amount of bitcoin is changing. The owner of the properties is foreseeing a bright future for the digital currency and having a news such as this, it would make those people apprehensive to invest in bitcoin believe that it is not just a scam currency.