Thing are changing in the capital’s commercial property market. Whereas two or three years ago it was proving almost impossible to tempt tenants to sign up to a pre-let agreement before a building was complete (indeed, often for some time after the building was complete), news now is that in the first quarter of 2013 a third of space currently under construction is pre-let. And with some months to go before many of these building are finished, that percentage could increase.