At first hundreds of properties became vacant. A few of the larger lots were converted into needed parks, the largest of which is Lezama Park, designed by the renowned French-Argentine urban planner Charles Thays in 1891 as a complement to the new Argentine National Museum of History. Most large homes, though, became tenement housing during the wave of immigration into Argentina from Europe between 1875 and 1930. San Telmo became the most multicultural neighborhood in Buenos Aires, home to large communities of British, Galician, Italian and Russian-Argentines. The large numbers of Russians in San Telmo and elsewhere in Buenos Aires led to the consecration of Argentina's first Russian Orthodox Church in 1901. Expanding industry to the south also led a German immigrant, Otto Krause, to open a technical school here in 1897.