For $13.5 million, a red neo-Greek near Harvard Square. See inside.

It may be in the heart of Cambridge, but 18 Ash St. offers plenty of privacy.

Tucked behind brick walls and towering evergreens, the five-bed, 5.5-bath home, which measures 5,376 square feet, is a historic beauty one block from Harvard Square. It is listed at $13,500,000.

“I think the most important thing about this house is that it offers a hidden oasis in the middle of Harvard Square. That says a lot,” said Ed Feijo of Gail Roberts, Ed Feijo and the team at Coldwell Banker Realty, which owns the listing. “We just don’t see this level of property with this amount of land in this level of finish, right there on the plaza.”

Built in 1854, the luxury home is situated on a third of an acre with a rolling lawn under mature trees. A grand foyer welcomes guests with hand-painted murals and a fireplace.

To the left is the 270 square foot living room, which has another fireplace and tall wooden casement windows overlooking the lawn. A sliding glass door leads to a glass plantation room that spans almost the entire length of the Harvard Square home. Beyond that, the 140-square-foot library features premium lacquer finishes, built-in shelving, and a fireplace.

To the right of the foyer is the south-facing dining room, which measures 213 square feet. From there, you can walk down a half flight of stairs to the four-season heated greenhouse, which is 235 square feet and filled with lush plants and a koi pond. Adjacent to the greenhouse is the massive 480-square-foot music room, featuring 10-foot ceilings and a fireplace, as well as French doors to the courtyard. It also connects to a pantry and cloakroom.

The custom kitchen is a dream for any aspiring chef and features a vintage Magic Chef oven that has been refurbished. The 100 square foot breakfast room is perfect for busy mornings. A dumbwaiter and a catering area are well-thought-out amenities.

On the second floor you will find a comfortable home office measuring 222 square feet with built-in storage. There is also a family room.

The 190 square foot master suite is the ultimate resort, with a fireplace and two walk-in closets, each measuring 62 square feet. It also has two bathrooms connected by a double steam marble shower. Nano doors open to the 414 square foot roof terrace, perfect for soaking up the morning sun.

A spiral staircase descends to a side patio, part of the carefully landscaped grounds, which also provides access to the greenhouse. A patio located under a canopy of evergreens is the perfect outdoor spot to enjoy a cup of coffee. It’s next to the heated pool, as well as cabanas and patios, perfect for a New England summer.

“You’re completely in this little hidden oasis there,” Feijo said.

Upstairs, the second floor includes two additional bedrooms. On the third floor you will find the last two bedrooms and another bathroom of the house, as well as a large storage attic and a closet.

The lower level of this Harvard Square home includes 789 square feet of storage and utility space, as well as a 129 square foot exercise room and a 182 square foot laundry room.

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