I am glad that the price is not in USD but in BTC which is quite rare to happen.
Even though these apartments aren't being sold in fiat specifically, it doesn't mean fiat isn't the leading factor ~ if Bitcoin was still in its $1000s, the number of coins required to purchase an apartment would be far higher.
Other than that, if I look through this whole thing, I get the impression that this is being done purely because the entities behind these apartments are extremely bullish when it comes to Bitcoin.
If Bitcoin increases even with 100% in value in the coming 1-2 years, it means that these people have done an excellent job into ditching fiat for Bitcoin ~ they already have my respect for that.
If this turns out to be a success, we can expect this to stretch out further. Imagine how things will be when multi billion dollar deals will be settled in Bitcoin at some point in the far future. #HODL