The Wall Street Journal writes about this, citing sources.

It is noted that the reason for the sale of property was the fall in the income of Saudi princes after the tightening of financial policies by Crown Prince Mohammed bin Salman Al Saud.

In particular, members of the royal family were forbidden to pay for vacations abroad, bills for water supply and electricity from the state budget. 

On April 16, Russian President Vladimir Putin and Crown Prince of Saudi Arabia Mohammed bin Salman Al Saud held a telephone conversation during which they discussed the situation around Ukraine, the settlement in Yemen and work within the framework of OPEC+.