Our culture, values and proven strategy will further differentiate us in the market, make us more valuable to our customers and enable us to deliver value to all our stakeholders.
In many ways we are a traditional property company; we own high quality, well located buildings across London which we regularly refurbish and redevelop. It is how we attract and retain customers that differentiates our business model. For over 30 years, Workspace has offered truly flexible lease terms and allowed customers to fit-out and use their space as they wish, enabling them to create and maintain their own individual identity. We have long believed in lease flexibility, retaining customers by providing them with inspiring buildings and great service.
Maintaining a close relationship with customers is critical to the success of our business. We gain vital knowledge from enquiries and viewings, analysing how customers use their space and listening to the daily feedback we receive from our Centre teams. These insights, supported by our investment in technology and the analytics that it provides, inform decisions across the business and, in due course, drive performance.
Despite the uncertain economic and political environment, the business has continued to see good demand over the year. Our marketing efforts across a range of channels, underpinned by the strength of our brand, have generated an average of 1,048 enquiries per month which have been converted into 103 lettings per month.
A significant feature over the last year has been the launch of some 341,000 sq. ft. of new and upgraded space, completing refurbishment projects at eight properties. We have been delighted with the level of demand for this space from both customers new to Workspace and existing customers looking to expand.
Our total rent roll was up 12.9% in the year to £127.5m. This has come from a combination of strong growth at our recently completed projects, the successful integration of recent acquisitions and continued rent roll growth at our like-for-like properties. As a result we have recorded another year of strong financial performance, with trading profit after interest up 19% to £72.4m.
With our clearly defined strategy, an attractive range of properties in London, a programme of exciting property upgrades, a strong balance sheet and ongoing investment in our people and technology, we are confident that Workspace will continue to embrace the future and maintain its market-leading position.