Sydney developer Astute Property has capitalised on strong momentum in the build-to-rent sector to sell an entire apartment development in Marrickville off-the-plan to a private investor.

The sale came just ahead of the official launch of the 43-unit development on a 1500sq m site at 265-273 Illawarra Road in the inner west suburb, which Astute purchased from the Hatziplis family for $16.7 million last year.