It's very difficult to speculate on how JC & Co would handle negotiations and if they'd get a better deal as there's really not that much in the public domain where they've had to 'do a deal' except for their new Victoria HQ. Apart from the obvious - offshore landlords - it seems they really overpaid, which rather makes me think we should keep them well away from Brussels.
"Why spend millions on leasing prime London real estate in a newly furnished (and therefore more expensive) unit, when cheaper alternatives are readily available. Nearby Battersea or Vauxhall are two emerging areas that have fantastic travel links and are a short distance from Parliament, at a markedly cheaper price.
DealMakerz would also point to the differing strategies adopted by Labour and Conservatives on their HQ’s. The Tories signed a lease in 2014 for 12,000 sq ft at 4 Matthew Parker Street, SW1 – paying their new landlord Aviva about £35 per square foot. That equates to approximately £420,000 per year, the same square footage, in a better location, for half the price of Labours deal. "
dealmakerz.co.uk/labour-party-splashes-2-3million-on-london-headquarters-expansion/