From
http://www.mexonline.com/propmex.htm
The Mexican Constitution prohibits direct ownership of real estate by foreigners in what has come to be known as the "restricted zone." The restricted zone encompasses all land located within 100 kilometers (about 62 miles) of any Mexican border, and within 50 kilometers (about 31 miles) of any Mexican coastline. However, in order to permit foreign investment in these areas, the Mexican government created the "fideicomiso," (FEE-DAY-E-CO-ME-SO) which is, roughly translated, a real estate trust. Essentially, this type of trust is similar to trusts set up in the United States, but a Mexican bank must be designated as the trustee and, as such, has title to the property and is the owner of record.