This is all correct and in line with my statement. The Savoy hotel indeed features a symmetry in its facade (which in itself has always been relevant in architecture) but the striking elements are the ornamental decoration, the steel accents or the stepped layout of the building itself. The projecture (if this is the right word) of the front facade has no aesthetical relation to the windows, as well as the front is not visually linked to the side facades. The building lives from those decorative elements, not the proportions of the entire building or of details in relation to each other.
Both styles, Art Deco as well as Modern Architecture, have their origins in the industrial revolution and subsequent production of objects and components in a mechanical process. They have also developed at similar decades. The striking difference though is that the former uses ornamentation as an essential yet basically superfluous styling element which has no historical relevance in the building´s context. Traces of Art Deco can basically seen in the US car styling of the 50s and 60s.
Modern Architecture on the other hand bases the layout on production feasibility, ornamentation is not only more difficult to achieve during production but also unnecessary as a aesthetically element. There is a huge portion of rationale involved, the attractiveness is achieved by balancing the proportions of the entire object and especially window openings as well as their detailed elaboration and is devoid of any ornamental decoration. Materials are usually reduced to plastered walls, (painted) steel and glass. So the building you mention can very well be one of the first examples of modern architecture, especially since these ideas spread rapidly due to the impact of the Bauhaus and the emigration of students and teachers under the Nazi regime. Walter Gropius, the founder of the Bauhaus, for example moved to the US at the end of the 1930s.
There are of course endless variations and evolutions of these definitions to be seen in Florida but I guess the local residents on the forum are far better informed about the architectural history in this State than me.