Asserta Properties - Barnet hasn't listed any properties for sale in the last 6 months. This could be because the agent specialises in lettings, or the branch may be closed. Asserta Properties - Barnet does have 16 reviews, with an average score of 4/5 If you're looking to sell in Belsize Park, you may want to choose an agent with more experience. Covering this area are other estate agents, such as Plasso - London and Oakhill Residential. However to see who will objectively do the best job selling your home, make sure you use our comparison tool.