New Delhi: Retailers at the country's costliest markets - Khan Market and Connaught Place -have urged the local authority to implement the new tax method to calculate the property tax at the earliest.At the New Delhi Municipal Corporation (NDMC) under which these markets come, the property tax is up to 25% of the rent collected while in other parts of Delhi it's just 2-3%.The association has suggested the NDMC to adopt a rational and equitable base rate, which is same as under MCD, as there should be no difference of property tax being paid by shops in the elite markets like Karol Bagh, South Extension, Malls located at Saket or Vasant Kunj to shops in Connaught Place and Khan Market."All we are asking for is one city one tax, which will simplify everything. For years, we have been fighting for property tax at par with the MCD area. Now that a gazette notification has come, NDMC is delaying the implementation process, which is impacting the traders in posh localities of New Delhi, said Vikram Badhwar, General Secretary, New Delhi Traders Association.Khan Market saw the least rental growth at 3% in 2025 with rents at $223 per square foot per year. Globally, Khan Market held onto its number 24 slot and is still India's costliest high street.