The rear part of the presidential building, popularly known as 'Sheetal Niwas', has been declared unsafe for use by technicians from the Department of Urban Development and Building, according to an official.
Following a safety assessment, technicians put red stickers to the rear part of the residence.
It should now be demolished and rebuilt, they advised.
The engineers' teams classify the houses in three categories - the house with a red mark is not suitable for stay, with yellow mark needs maintenance and those marked with green colour are appropriate for living.
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Only four rooms of the residence were declared fit for use. All other rooms were marked with yellow stickers.
Technicians have said that these rooms should not be used for safety purposes.
President Ram Baran Yadav has moved to a safer place following the incident. He had stayed in makeshift tents for six days after cracks appeared on the residence due to the temblor.
Over 2,000 engineers were deployed voluntarily to check safety of houses here in the aftermath of the temblor, the country's worst in over 80 years, and have checked over 13,000 so far, half of which are unsuitable to live or require renovations.
Two ministries - Youth and Sports as well as Labour and Employment - were also declared unsafe.