Mr. Surya Kant, J.: - DLF Limited and its associate Companies [for short ‘DLF’] and Ansal Properties and Infrastructure Limited [for short ‘Ansal’] through their respective writ petitions have laid challenge to the constitutionality of Haryana Development and Regulation of Urban Areas [Amendment and Validation] Act, 2012 [Haryana Act No. 4 of 2012]. Ansal has further sought a direction for the refund of Rs.983.74 lacs along with interest @18% per annum from 21st July, 2000 besides seeking quashing of the demand notice-cum-letter dated 05th March, 2013. DLF also seeks a writ of prohibition to restrain the respondents from claiming or recovering Internal Community Building Charges as well as a direction for the adjustment and refund of the amount deposited towards ICB charges along with interest @18% per annum.

2. The genesis of the reliefs sought by the petitioners lies in an inter-parties judgment of the Hon’ble Supreme Court between the Ansal and State of Haryana and its authorities which is reported as Ansal Properties and Investment Limited Versus State of Haryana & Ors., [2009(3) Law Herald (SC) 2133] : 2009[3] SCC, 553.

3. Before adverting to the core questions arisin