via Philippine Inquirer, 09 March 2021: The short answer is no, but the discussion of the basilica’s history is in the backdrop of its conservation and heritage status.
For years, it was rumored that San Sebastian Basilica in Manila was the work of Gustave Eiffel, the man behind the iconic Eiffel Tower in Paris, France and many other architectural landmarks around the world.
Now, it can be confirmed that it is not.
Tina Paterno, former head of San Sebastian Basilica Conservation and Development Foundation Inc. (SSBCDFI) disproved the said claim, which can now be described simply as a myth.
In the conservation management plan (CMP) crafted for the basilica this year, it is noted that the disapproval came directly from the heirs of Eiffel, with whom Paterno had a series of correspondence.
The document notes that Paterno “received the definite reply that Eiffel was not involved with San Sebastian.”
Source: Was San Sebastian Basilica designed by Gustave Eiffel? | Inquirer Lifestyle