19 year old Aminur Khan, of Robin Hood Gardens, Poplar appeared in court today accused of stabbing 16-year-old Ajmol Alom to death on Monday night.
Ajmol, who has been described as a star pupil, was wounded in the thigh during the incident in Spey Street, Poplar.
Khan is also charged with the attempted murder of Ajmol's friend Azime Rob, also 16, who was stabbed through the cheek.
Both were taken to hospital, where Ajmol died.
More top news
The property developer painted the mews house in March last year after she was denied permission for a basement below the property.
Profits at the estate agent plummeted 42% in the first half of the year.
Ionut Gheorghe, 27, was detained in Los Molinos near Madrid on Friday by Spanish police under a European Arrest Warrant.