The Davis Cos. has sold its Tower Point office building in Boston’s Fort Point for $62.1 million, reaping an $18.7 million gain after just two years of ownership.

The converted warehouse was sold to Boston-based Rockpoint, a real estate private equity firm.

The Boston-based developer spent nearly $7 million updating the 155,170-square-foot property at 27 Wormwood St., increasing the occupancy rate from 74 to 95 percent with a group of new tech tenants.

Rents in Fort Point’s 43 brick-and-beam office buildings have risen from the high $20s to low $40s per square foot range in the past few years. Availability of large contiguous blocks of space has dwindled as the neighborhood has become a popular destination for tech companies, including ZipCar and LogMeIn.

The opening of State Street Corp.’s 500,000-square-foot Channel Center offices in June 2014 brought 3,500 employees to the A Street corridor at the neighborhood’s southern edge, benefiting surrounding properties, including Tower Point.

“With State Street and the retail around them opening, that certainly was a catalyst getting people comfortable with the location,” said Duncan Gilkey, a senior vice president with The Davis Cos. “Five years ago, it would have been considered the other side of the railroad tracks. With a five-minute walk to South Station, it never really was. But perception sometimes is reality.”

Renovations to the 115-year-old structure included a 7,500-square-foot courtyard with oversized chess set outside the main entrance, removal of drop ceilings and creation of an open floor plan for most tenants. Healthways is the largest tenant, occupying the entire 26,000-square-foot sixth floor. Other tenants include Rethink Robotics, NPR, Zerto and Owner IQ.

Newmark Grubb Knight Frank Vice Chairman Edward C. Maher Jr. represented The Davis Cos. in the transaction.