Keystone Realtors aims to achieve Rs 4,000 crore in pre-sales for fiscal 2026.Undersupply is driving demand in the real estate market.Keystone Realtors is significantly increasing its construction spend, targeting Rs 827 crore for the coming year.Boman Irani calls for a shift toward global norms for affordable housing and updates to the price cap that qualifies homes for GST benefits.