If base FSI in a Mumbai suburb is 1.33, a developer may be allowed to buy up to 0.5 additional FSI, taking the total to 1.83 – but at a price.
A farmer whose land is acquired for a metro depot gets TDR worth 1.0 FSI on 1 acre. A builder in a high-demand zone buys that TDR and adds 1.0 FSI to their project.