A proposal for a new fire substation to serve the exclusive Starwood neighborhood and the McLain Flats corridor will go before the Pitkin County Planning and Zoning Commission on Tuesday. The Aspen Fire Protection District and the Starwood Metropolitan District are jointly submitting the proposal, which is backed by a $3.1 million bond measure the homeowners association passed in the November election. The two-story, 4,300-square-foot building also would include two two-bedroom apartments for firefighters and their families, said Aspen Fire Chief Rick Balentine. While the substation is to primarily serve homes worth millions of dollars — Balentine calculated there is $1.2 billion worth of residential property in the area northwest of Aspen — the fire chief emphasized the importance of the affordable-housing units.