Based on this Global News piece the commercial sector is doing well in London.
http://globalnews.ca/news/3341199/positi...-growing-tech-sector/?utm_medium=Twitter
I don't see an office tower being announced any time soon as most of the growth will likely be small boutique conversions of industrial space or retail space turned into offices.
Would be quite a surprise to see the 2nd tower of One London Place be announced for construction.