British Land said it has now agreed to fill 70% of The Leadenhall Building, known as the Cheesegrater, and has sought to reassure that three fractured bolts in the skyscraper were not affecting the structural integrity of the building.After warning in November that two bolts had fractured at the building, an investigation by the contractor and structural engineer found the problem was limited to certain bolts, which will be replaced as a precautionary measure.The FTSE 100 company has leased out a further 93,400 square feet of space, including hiring out one floor to the building's own architects, Rogers Stirk Harbour & Partners (RSHP), who have signed a binding 15-year agreement to take the 14th floor, the largest remaining floor in the building.A further five floors are also under offer in three additional transactions, while virtual office company Servcorp opened its offices in December and welcomed Dun & Bradstreet as the first occupier to move into the building.