Construction is ramping up with the River 1 mixed-use development in Milwaukee's Harbor District

Construction is beginning to ramp up on a mixed-use development in Milwaukee's Harbor District.

The River 1 development overlooks the Kinnickinnic River west of South 1st Street and north of West Becher Street, at the site of the former Horny Goat Hideaway tavern.

It's being developed by Brownsville-based utilities and infrastructure contractor Michels Corp., which will have its Milwaukee office there.

The development's first phase will feature an eight-story building, with around 130,000 square feet that Michels would eventually anchor with up to 400 employees; a 1,000-space parking structure; and a RiverWalk.

That phase is be completed by summer 2020.

River 1's additional buildings could eventually include two more office buildings, each with 50,000 square feet; an apartment building with around 120 units and a restaurant on the ground floor; and a hotel with roughly 120 rooms, according to conceptual plans.

With those additional buildings, River 1 would total over $100 million.