Perennial buys option for stake in £1bn Undershaft Louisa Clarence-Smith05/01/2017 | Investment/finance | EnglandPrintDownload Singaporean developer Perennial Real Estate has secured a call option to acquire a 20% stake in the £1bn development at 1 Undershaft, EC3. The property and healthcare company Thank you for reading EG Want to read more? Enjoy a story a week for FREE. Register Find Out More Already a subscriber or registered user? Sign in