Telford Court is a 4 story residential apartment block in Streatham Hill, just south of Brixton. When it was built there were 32 flats divided into three blocks, with the central block having 16 and the other two having 8 each.
Telford Court (…) was designed by Frank Harrington in 1931. The front of the block is set well back from the road above the shops. The design has a central bay and four side bays. Above the shops are balconies with French widows and of particular note are the four attractive pantiled roof top belvederes. The windows of this building are neo-Georgian in style, with eight over twelve timber sashes. The brick facade has a white rendered band below the parapet and at 2nd floor level the window surrounds have pronounced keystones. The plans for this scheme were submitted for approval in 1930 and by 1933 the flats were ready for occupation.*
* Lambeth report on the Streatham High Road & Streatham Hill Conservation Area
The flats are built according to 2 different designs; the ones in the outer blocks (A & C) are squarish while the Block B flats are long and thin.

The architect, Frank Harrington, designed several buildings in Streatham, including Streatleigh Court, opposite Streatham Hill station..
You can read more about the history of Streatham on Ideal Homes.