The building was constructed between 1928-1930 by the Metropolitan Police as flats for married policemen. It became council flats in 1974. It is named for Sir Charles Rowan, who “was one of the first commissioners of the force when it was formed in the 1820s.” G. Mackenzie Trench was the architect for the Met. More at British Listed Buildings.
It’s great the way I’m learning all these new facts about London buildings from an American. Thank you