Developers renovating the historic downtown Midland Building into a four-star, boutique hotel plan to open in the spring.

Surety Hotel, located at 206 Sixth Ave., will have 138 rooms, a 200-person ballroom, meeting space and a private outdoor courtyard. The Mulberry Street Tavern, a restaurant and bar, will open on the first floor.

The Chicago-based Aparium Hotel Group has shared new images of the space with the Des Moines Register.

“The Des Moines market is experiencing incredible growth, and the expression of culture we are seeing through emerging art, entrepreneurialism and development is among the most exciting we have witnessed across the country,” said Mario Tricoci, co-founder of the Aparium Hotel Group, in a news release. “We are very much looking forward to opening the Surety Hotel as downtown continues to thrive.”