India's commercial real estate market still has plenty of room to grow, with vacancy rates now at their lowest in several major cities.The first quarter of the year has been very strong, with gross leasing of almost 80 million square feet.Rentals have risen 7.5% to Rs 105 per square foot, showing long-term commitment to the Indian market.The recent surge in return-to-office mandates is providing strong tailwinds for the commercial real estate market.