The scheme will see 460 new 1, 2, and 3 bedroom properties built on land next to Southall station.
City Hall says the viability of the capital’s commercial and cultural centres is under “immediate threat”.
The Assembly’s latest annual Affordable Housing Monitor shows 17,256 affordable starts got underway in 2019/20.
Crossrail bosses say the troubled rail link is unlikely to open before 2022 and will need a further bailout of at least £450m.
TfL Go app is available initially for iPhones with an Android version promised “by autumn”.