Miami’s STA Architectural Group originally planned to use solid ipe for the eight columns on this high-end residence, which is currently under construction in Bal Harbour, Fla. But when logs of sufficient size turned out to be unattainable, the firm asked Orleans, Mass., boat-builder Suzanne Leahy to build the columns out of mahogany.

Leahy began by making a precise and ingenious jig — itself a two-week effort — on which to assemble and epoxy-glue the hollow staved pillars in vertical half-sections; the components were produced by fellow boat-builder Tom Olsen on a CNC router. After installation, the segments’ deep vertical and horizontal banding reveals will receive bronze...

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