The report, which focuses on a high level view of rents, rates and service charges for Grade A offices across the country over the last six months of last year, highlighted that costs only rose in three locations: Heathrow, where costs rose by 9.6% to £42.75 per sq ft, Birmingham city centre, where costs rose by 5.3% to £44.25 per sq ft, and Midtown, where costs rose by 2.6% to £98.25 per sq ft.