Final answer:
Leandro Locsin, a renowned Filipino architect, is credited with the largest single work known as the Cultural Center of the Philippines, showcasing his modernist architectural style.
Step-by-step explanation:
The Filipino architect known for his use of concrete, floating volume, and simplistic design is Leandro Locsin. Among his numerous works, the Cultural Center of the Philippines is considered to be his largest single work. As an advocate for modernist architecture, Locsin's designs, much like those of other modernists including Oscar Niemeyer and Frank Lloyd Wright, display a strong connection between functionalism and the visual arts. This approach is seen in Locsin's pivotal role in shaping modern architecture in the Philippines, for which he was named a National Artist.