The topping out ceremony took place at Vic Johnson House on Friday as builders reached roof level. Vic Johnson House will provide 60 high-quality modern retirement apartments and communal spaces, exclusively for residents over 55.
Gateway's Chief Executive Kate Dodsworth said: "Our redevelopment programme is ambitious. We're creating modern high-quality homes that are affordable. We're on track to achieve our goal of building 500 homes by 2020 - and today's Vic Johnson milestone is a very big part of that.
The Vic Johnson project, which began works in December 2017, is due for completion in early 2020.
Gateway Housing Association is a community-based housing association with around 3,000 properties primarily in the London Borough of Tower Hamlets and surrounding boroughs.