The Capital Development Authority (CDA) on Tuesday sealed four additional houses in continuation of its operation against the violation of its building by-laws. Houses sealed by the CDA were located in sectors F-7/2 and F-7/4. CDA Directorates of Enforcement and Building Control also took apart in the operation. House No15 in Street-37 that was used as a boutique showroom, house no42 in street-20 that was being used as a dress show room, house no15 in street-18 that was being used as a salon and house No64 on Nazim-ud-Din Road, Sector F-7/4 that was also used as restaurant were sealed for non-conformation and violation of CDA’s building by-laws.