Grand but run-down buildings, with fading flamingo-pink and lime-green faaades and ornate columns, flank a raised promenade of laurels, gas lamps, and marble benches.
The buildings are small and humble but are expertly maintained. 
mnli hypothesis: The buildings are small and humble but are expertly maintained.  premise: Grand but run-down buildings, with fading flamingo-pink and lime-green faaades and ornate columns, flank a raised promenade of laurels, gas lamps, and marble benches.