It is the largest office REIT in Asia by area.
Shares in the Embassy REIT closed at 354.42 Indian rupees on Friday in Mumbai, giving it a market capitalisation of $4.15 billion.
Blackstone currently has a 32% stake in the Embassy REIT and at the current market value the proposed sale by Blackstone would represent 7.2% to 9.6% of its stake, according to Reuters calculations.
ADIA INTERESTADIA is likely to pick up about $200 million of Blackstone's stake sale, with talks also ongoing with other possible investors, the first source said.
For ADIA, the investment would expand its interest in the Indian office market.