The transaction comes after Ortega's purchase last month of a luxury residential building with 120 apartments for rent in Dublin, Ireland, for around 100 million euros ($109 million).

Ortega's firm has also acquired luxury residential and office buildings in the United States and Canada in recent years as part of a strategy to invest in multiple real estate assets.

Spanish newspaper Cinco Dias, which earlier reported the deal, said Pontegadea had agreed to buy from Abrdn fund the office building near the Oxford Circus junction on 33 Foley Street in the British capital's trendy Fitzrovia area.

The building was a former BBC office that was later redeveloped, the report added.

($1 = 0.8069 pounds)

(Reporting by Corina Pons Editing by David Latona and Mark Potter)