Blackstone Inc. is building a built-to-suit warehouse for Amazon India in Delhi, the first in-city fulfillment centre for the e-commerce giant in the national capital, sources said. The warehouse is spread over an area of 500,000 sq ft, and Amazon has signed a 20-year lease with Horizon Industrial Parks, the entity under which the US-based asset manager has housed its logistics assets in India. According to official reports this is the first-ever built-to-suit arrangement between Amazon and Blackstone anywhere in the world. The facility is expected to be ready by October. A spokesperson for Amazon India said, “We are always adjusting our network to best fit our business needs and improve the experience for our employees, associates, and customers. However, we do not comment on what we may or may not be doing in the future,” said reports.