It seeks to impose ceiling on vacant lands in urban agglomerations having a population of two lakhs or more and for that purpose classifies such urban agglomerations in various cities and towns in all the State and Union Territories into four categories 892 and fixes the ceiling limit for each of the categories thus: Ceiling limit on vacant land is fixed at 500 sq. metres for the urban agglomerations of the metropolitan areas of Delhi, Bombay, Calcutta and Madras having a population exceeding ten lakhs falling under category 'A ', at 1,000 sq. metres for urban agglomerations with a population of ten lakhs and above, excluding the four metropolitan areas, falling under category 'B ', at 1,500 sq. metres for urban agglomerations with a population between three lakhs and ten lakhs falling under category 'C ' and at 2,000 sq. metres for urban agglo merations with a population between two lakhs and three lakhs falling under category 'C ': vide s.4 read with Schedule I of the Act.