From the LPC designation report for Tifereth Israel:
the synagogue is a two-story wood-frame building that was originally clad with horizontal clapboard siding. The original wood stoop and railing have been replaced with a brick porch with an iron railing, and the wood clapboard siding has been covered with stucco. Despite these alterations, the Congregation Tifereth Israel remains a rare survivor as what is likely the oldest purpose-built synagogue in Queens and a striking representative of a regional vernacular style.
Good for Tifereth Israel. However, the official reason for St. Saviour's being rejected by LPC was because it has aluminum siding (which is more temporary than stucco...) The real reason is because the Bloomberg administration wants to shoehorn hundreds more people into a full block in Maspeth. Saving community landmarks in red-lined areas takes a back seat to the "million more people by 2030", after all. The Bloomberg Legacy in Queens will be one of neighborhood destruction via overdevelopment. Mark my words.