Longfellow Real Estate Partners has added a second tenant to its massive 180,000 square foot Exchange Place building in RTP. Negotiations are currently underway to add a third for the building, which is geared to life science firms.

Longfellow is extremely busy as it’s also is preparing to build two mixed-use buildings in its 15-acre Durham Innovation District project

The new Exchange Place tenant is Envisia Therapeutics, a spinout from Triangle-based Liquidia.

Envisia will occupy nearly 12,600 square feet in Exchange Place.

The first tenant was Aerie Pharma.

A Longfellow spokesperson also tells WRAL TechWire that negotiations are underway to lease 15,000 square feet of lab space.

“We can’t release the name of the tenant just yet,” the spokesperson says.

Plus, another 13,000 square feet is under construction to offer a combination lab and office space, he adds. The space is scheduled to be available in early 2017.

Longfellow bought the Exchange Place building in 2014.

“Longfellow is successfully developing, managing and leasing the largest science and technology portfolio in the Triangle, supporting the wants and needs of mature and expanding life science and technology companies,” said Jessica Furman Brock, Managing Director of Longfellow Real Estate Partners, in a statement.  “We’re thrilled to welcome Envisia Therapeutics and their team to the Longfellow community and look forward to helping them as they continue to innovate and grow.”

Added Envisia CFO Eric Linsley: “Envisia continues to make great strides in its effort to advance novel therapeutics for the leading causes of vision loss and with that progress our needs often change.  Since the beginning, Longfellow has been a valued partner in ensuring that we stay ahead of that growth with state-of-the-art R&D facilities and other workspaces that foster comfort, convenience and productivity.  We are very pleased with our selection and experience.”