The DA! collective is an art collective that squats in London, England, co-founded by Simon and Bogna McAndrew, Stephanie Smith, Samuel Conrad, Julika Vaci, Aishlinn Dowling, Sam Padfield and Murat Bulut Aysan. After squatting in three buildings, they received national attention when they squatted a townhouse in Mayfair, Westminster, Greater London in October 2008. The property, at 18 Upper Grosvenor Street, is a 30-room grade II-listed 1730s mansion worth an estimated £6.25 million owned by the billionaire Duke of Westminster, Britain's wealthiest private landlord.