On a muggy July day, in a swanky lawyer’s chamber, the senior summons his junior with great urgency. “Quick! Hurry, I should get an OTP,” he says, handing over his phone. The junior exits the hall, steps outside the basement of the newly built building in posh Jangpura Extension to catch the cellular network signal. As soon as he hears the familiar sound of the notification, he rushes back to his senior. Delhi’s ubiquitous basement offices — often in upscale residential neighbourhoods — are some of the most sought-after real…