extension of time-limit for exercising the option by promoters/ builders to pay tax at the old rates of 12%/ 8% with ITC by 10 days from 10th May to 20th May, 2019 by suitably amending the notification No. 11/2017- STR dated 28.06.2017 as amended by notification No. 3/2019- STR dated 29.03.2019.