(Reuters) -Office rental firm IWG retained a "cautiously optimistic" outlook after posting a 48% surge in half-year profit on Tuesday, helped partly by high demand for its spaces and improved pricing. "Our outlook for the full year remains cautiously optimistic given the growing demand for hybrid working solutions tempered by FX headwinds and a challenging economic and competitive environment," the company said in a statement. The UK-listed owner of the Spaces and Regus brands said adjusted core profit from continuing operations for the six months ended June 30 jumped 48% on a constant currency basis to 198 million pounds ($252.6 million).