I have asked IPSA to reply.
IPSA moved into new office premises at 85 Strand in March 2019. The forecasted cost of this move is £732,900. This budget was approved by the Speaker’s Committee for the IPSA in January 2018. IPSA’s Annual Accounts for the 2018-19 financial year are being finalised and will be laid in Parliament in November. The Speaker’s Committee will have an opportunity to scrutinise this and other expenditure.
After reviewing properties on the market, the offices selected met IPSA’s criteria and offered the best value for money to the taxpayer over the long term, with competitive running cost over the life of the lease after completing initial fit-out work. Locations outside of London were considered. IPSA concluded that basing IPSA’s office in London and within reasonable distance of Parliament would ensure that IPSA can provide a better support to MPs and their staff, including regular meetings between them and their IPSA account managers.