Kammala jumla mai zuwa: 1960s1970s: Lin ya ci gaba da faɗaɗa ƙwarewar kamfaninsa a cikin simintin da aka riga aka ƙaddara zuwa sabis na ba da shawara mafi girma, tare da ayyukan da suka haɗa da simintin da aka ƙarfafa da al'ada, ƙarfe na tsarin, masonry, da tsarin katako. A cikin 1967, ya tsara bangon bango mai hawa 18 na Bank of America a Managua, Nicaragua. Hasumiyar da aka yi da simintin gyare-gyare na daya daga cikin gine-gine guda biyu da aka bari a tsaye bayan da kasar ta
Girgizar kasa ta shekara ta 1972. Lin kuma ya zama sananne ga sababbin abubuwan da ya kirkira, kamar Rio Colorado Bridge, gada mai ratayewa da ke jujjuyawa a kan wani rami mai zurfi a Costa Rica. A farkon shekarun '70, kamfanin ya kuma kafa ofisoshinsa a Taiwan da Singapore.