To begin with you can get the Termite Control treatment for the entire building done including all the flats (warranty). Often, this treatment is done only for the common areas like external perimeter, staircase, and passage. The most important place to be treated are the flats which are excluded. We do not recommend this because termites attack cellulose, which is present in materials like paper, cloth, and wood which is found inside the flats. Getting only the external perimeter treatment will not free the building of termites.