Four years after putting the land under contract for Roanoke City Center, the vision of construction and development company Integrity Group is beginning to take shape on the southern end of the city’s historic Oak Street. The 21.5-acre mixed-use development is already home to Roanoke’s new City Hall, which opened in March, as well as residential lofts and a parking garage. Models for the city’s first brownstone homes also opened earlier this month. Over the next several months, the center will add new retail and office space as well as a family entertainment center. Integrity Group’s development is already attracting tenants. Sweet shop Kilwins and Grand Salon are both expected to open locations this summer. “It’s a great place for families to be able to take advantage of that unique Roanoke culture,” Integrity Group CEO John Delin said. “For us, it being home to our office, we wanted to play a significant role in what Roanoke will become.” Though not being developed by Integrity Group, the Peabody Hotel is part of the center and is expected to begin construction later this year and open in 2021. The hotel will include 300 rooms, event space and a spa.