What Record Rents and Vanishing Grade A Supply Mean for Developers, Landlords, and Occupiers

London office supply is the tightest it’s been in years. Prime City rents hit a record £130.80 per square foot in Q1 2026, up 40% year over year. The City Core has just 1.1 years of Grade A supply left, against a 10 year average of 1.7. Mayfair and St James’s are down to 0.7 years. No Grade A space of scale is expected before Q3 2027, and the squeeze runs through 2029.

New development can’t keep pace. 2026 completions are down 40% from 2025, and over half of future supply is refurbishment, not ground-up. Grade A still took 78% of Q1 2026 leasing, proof occupiers are paying up for quality as terms shorten and rents rise.

This event puts developers, landlords, occupiers, workplace leaders, and proptech innovators in one room to work through what that means: where ground-up still pencils, what occupiers actually want, how leasing and operating models need to shift, and where AI is already changing how buildings run. If you’re making London office decisions in the next two to five years, this is built for you.