LONDON–(BUSINESS WIRE)–London City Core saw an increase in office demand, as vacancy rates for best-in-class space fall to 2.1%, according to data from CoStar, a global leading provider of online real estate marketplaces, information and analytics in the property markets.The Square Mile has accounted for over 42% of Central London demand for 4-Star offices so far in 2026, compared with just 18% for 5-Star offices.“The strength of the flight-to-quality trend, a fundamental part of which is loca