The average rate on the 30-year, fixed-rate mortgage fell to 3.99 percent from 4.06 percent last week.
The 18,382-square-foot building is on 1.29 acres.
The recent increase in multifamily housing projects is boosting business for an expanding local supplier.
The three highest-priced home sales in Valley Stream last month ranged from $665,000 to $690,000.
Prices rose 6.8 percent in Suffolk and 3.1 percent in Nassau year over year.
The project will transform the former West Islip manufacturing property into a retail center.
The new 2,412-square-foot showroom is much roomier than its original 300-square-foot mall store.
The 28,373-square-foot building is on 1.44 acres.
The three new zoning districts are located around the Lawrence and Inwood LIRR stations and business corridors along Lawrence Avenue and Doughty Boulevard.
The project is part of the annual National Women Build Week for Habitat for Humanity.