Blackstone was an early entrant into office property and information technology (IT) parks. : Blackstone, the US-based private equity fund manager, is looking to buy more of under-construction office projects. It is preferring these projects to fully built and leased properties due to more of competition, falling yield and the like. Blackstone has been buying office property in this country since 2011, having invested in a little over 100 million sq ft. About 60 per cent of this is in completed properties. This strategy could change.