The tied firm, which will be known as Masons Buxeda Menchen, will progress to full merger over the next three years, providing a set of financial and convergence criteria laid down by the UK firm are met.
Buxeda Menchen has 19 lawyers, including six partners, and will continue to practise only Spanish law. The Spanish firm's managing partner, ex-Denton International lawyer Javier Lasa, will continue to run the tied office.
Masons, which had only a Brussels office in Europe before this link, wants to open in Spain to gain a Latin American foothold, where it wants to sell its construction expertise.
“We see Spain as a way in to Latin America. Latin America has so many infrastructure projects going on, and Spanish companies are the largest investors in the region,” said Masons partner and management board member Tony Bunch.