If you build it, they will come. In fact, it seems Harwood International can't build office space in its Dallas Harwood District fast enough to satisfy corporate demand, which is why another record-breaking office tower is in the design phase.

With 98% of the existing district leased, Harwood spokesperson Jessica Young Reid said the company filed paperwork with the city this month to build what will become the tallest office tower in Harwood to date.

Development plans filed with the city show Harwood No. 12 includes a build-to-suit 40-story office tower on a 1.27-acre site off Caroline Street in Dallas and bordered by Payne, North Akard and Field streets.

The development includes parking, an observation deck/sky lounge and 498K SF of developed office, retail and restaurant space.

Other planned amenities include curated gardens and a 21K SF amenity deck complete with fitness and conference facilities, according to documents filed with the city.

The Harwood District launched in 1984 with the Rolex Building serving as the district's original anchor building. Harwood International owns more than 11M SF of developable rights within the 18-city block Harwood District near Uptown.

The Harwood District as a whole includes $3B worth of office, retail and residential development, Young Reid said.

So far, roughly 2M SF of prospective tenants have expressed interest in the new Harwood 12 development, she said.