By 1924, INC had about 3,000 to 5,000 adherents in 43 or 45 congregations in Manila and six nearby provinces. By 1936, INC had 85,000 members. This figure grew to 200,000 by 1954. A Cebu congregation was built in 1937—the first to be established outside of Luzon, and the first in the Visayas. The first mission to Mindanao was commissioned in 1946. Meanwhile, its first concrete chapel was built in Sampaloc, Manila, in 1948. Adherents fleeing for the provinces away from Manila, where the Japanese forces were concentrated during World War II, were used for evangelization. As Manalo's health began to fail in the 1950s, his son Eraño began taking leadership of the church. Felix Manalo died on April 12, 1963. Within the span of 49 years of his administration, INC had 1,250 local chapels and 35 large concrete cathedrals.