By Elliot Gulliver-Needham Office giant Derwent London has upgraded its expectations for 2024 as demand for its central London properties remained robust. In the firm’s 2023 results, it revealed it had brought in £28.4m of new rent, up from £9.8m in 2022 and eight per cent above its estimated rental value for the year. So far this year, the FTSE 250 property firm said it had booked in new rental income of £1.8m, with a further £2.7m under offer. Gross rental income for 2023 totalled £212.8m, up 2.8 per cent from £207m in 2022. However, the company’s total return for the year was -11.7 per cent…