Fraser Bond are the leading lettings and property management agents for Premier House - London SW1P. Premier House is a 78,000 sq ft mixed-use development in Westminster, London SW1. 2019 - Derwent London sells the building for £50.0m before costs in Q1. The 60,700 sq ft freehold office was vacated just prior to sale. References: 1. Derwent London plc Interim Results 2019 derwentlondon.com.