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Location: Boston, Mass.
The Skinny: This sprawling mansion in Boston's tony Back Bay neighborhood must have been quite a wreck back in 1997, when a pair of newlyweds snapped up the 10,000-square-foot classic for just $328K. Since then the couple have thoroughly renovated the turn-of-the-century brick pile, which now holds eight bedrooms, seven bathrooms, an elevator, a gigantic dining room with space for 30 guests, a modern kitchen, an epic master suite, and seven coveted private parking spaces. Of course, after all that hard work, they're expecting some sort of profit, but the near $13M ask has them set to rake in close to 40 times their original purchase price.