No single sign is conclusive. Together they narrow the answer.
Stone arches, vaults or thick pillars in the entrance or shop point to pombaline.
A marked reduction from lower to upper landings is typical of a gaioleiro.
Braced timber with rubble infill marks a frontal. Plain masonry or light partitions do not.
Timber flexes. A rigid floor in an old building is a placa or a later concrete slab to ask about.
A mansard or top floor in a different style points to a later addition.
Caderneta and licensing file often record later works, not the original build.