Best properties on the market

This week: Dramatic conversions

1. Portland, Maine Formerly a World War II power plant, this four-bedroom home sits on Casco Bay and has water views from most rooms. Amenities include a hot tub, a pool, and access to a boat mooring. A separate building could be converted to a guesthouse. $1,500,000. Peter Thornton, Legacy Properties/Sotheby’s International Realty, (207) 770-2292

2. Hamilton, Mont. Built in 1897, Tammany Castle was created to be a stable for a champion racehorse owned by copper king Marcus Daly, then one of the richest men in the world. Now a luxury four-bedroom residence, the building is located on a bluff surrounded by historic gardens at the heart of what was once Daly’s 1,000-horse stock farm. $2,950,000. Keith Lenard, Hall and Hall, (406) 542-3762

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4. San Francisco Albion Castle, which overlooks San Francisco Bay and the Golden Gate Bridge, was built in 1870 to house the Albion Ale and Porter Brewery. Later the headquarters of the Mountain Spring and Water Co., the building is now a four-bedroom home that sits atop springs that still produce 10,000 gallons of water a day. $1,349,000. Charlene Attard, Alain Pinel Realtors, (415) 608-8585

5. Stanfordville, N.Y. Built in 1860, this former railroad depot sits on a three-acre property that includes gardens, a one-bedroom guesthouse, a warehouse with a small glass-walled artist’s studio, and frontage on Wappingers Creek. The interior features 12-foot ceilings and original wainscoting. $675,000. Barbara Novak, Houlihan Lawrence/Christie’s International Real Estate, (845) 677-6161

Steal of the week

6. Mathews, Va. Built in 1894, Wolf Trap Lighthouse is a three-bedroom brick residence located atop an iron pier in the middle of Chesapeake Bay. The structure is being sold with a waterfront lot more than 3 miles away to be used as a boat launch. The building has a new roof but needs repairs. $288,000. Laura Pierce, ERA Bay and River Real Estate, (804) 694-9145