The church sits on a plinth of about 18 cm that may be seen along Calles Cuba and Acosta. The building is 60m long as measured on the exterior, east–west along Calle Acosta, although from the interior it appears that the last 10m was a later addition as the walls of this ten-meter square room are thinner (along Calle Acosta) and the roof structure does not span the ten-meter dimension. There is a column in the middle of the room to distribute the weight of the roof.
