Nobleman's House in Calle de Santo Domingo (Santillana del Mar)

I couldn't wuite work out what building this is, to be honest, but going by the size and coat of arms above the entrance, I guess it was residence of someone significant. Its not uncommon to find houses featuring large shields or coat of arms on their facades. These were added by residents who left for the New World (specifically Mexico), returned rich, and wanted to display their newfound status.