The true cost of renting in Bangalore now

Two years ago I'd have laughed at these prices. My kids have moved out, so we're selling our big house and looking for a manageable 2BHK flat, maybe around Aishwarya Crystal Layout. But seeing rental quotes for 2BHKs in Whitefield or Sarjapur Road... they're just crazy. Friends are saying rents shot up 30-40% in two years. Is this sustainable, or will it finally stabilize, I wonder? Makes me question if buying an investment property for rental yield here still makes any sense at all.