Most of the smaller traditional "infil" type of developments are on the fringes of downtown. There are quite a few of them but they don't get the attention that the 150 or so 40+ story towers proposed around town get. Insane land prices in the actual core make any smaller developments pretty much impossible.
Here for example is the area just to the west of Brickell (west of the Metrorail tracks). This area had been filled with old run-down 3 to 5 story apartments that are being raised and replaced with 15 to 25 story rental towers at a quite a pace. East of the metrorail tracks very little under 40-stories gets built. There was a 3 to 5 story Jewish center built recently and in the CBD, Miami-Dade College has built a few 5 or so story classroom, activity center type buildings and there is a Whole Foods under construction but it is being built to support a future apartment/condo tower on top of it.
(from QuantumX @ssc)
Here is another image showing the northern fringes of downtown, Edgewater (bottom of the image). A ton of 15 to 20 story smaller scale towers have gone up and are going up in this area but recently a few proposals for monolithic 55+ story towers in this area so we will see what happens with that neighborhood.