Mayor Elicker and Spinnaker VP Frank Caico (center) ... ... celebrate new apartments at the "Anthem at Square 10" ... ... as property manager Alves (right) shows off common area "plant wall." Brian Alves reached back in time to his teenage years attending concerts by Aerosmith and Huey Lewis and the News at the Coliseum — as he gave reporters a tour of the shiny new mixed-use building that has risen from the ex-venue’s ashes, complete with 200 apartments, ground-floor retail space, a pool, a gym, and a common room buttressed by a ​“real life plant wall.”Alves works for Spinnaker Real Estate Partners, the Norwalk-based developer that, in partnership with the Fieber Group and KDP, just finished building ​“Phase 1A” of the Coliseum-site redevelopment at 275 Orange St.On Monday morning, after a celebratory press conference and ribbon cutting, Alves gave reporters a tour of the apartments and amenities that are now open in the first building to rise atop the grave of the Coliseum rock and hockey arena and convention center. That complex was blown up on Jan. 20, 2007, leaving the 3.5‑acre block bordered by Orange, State, George and MLK Boulevard empty ever since.The first renters started moving in to the new building, dubbed ​“The Anthem at Square 10,” in late October, according to Spinnaker Vice President Frank Caico. Alves, who works as the building’s property manager, said that 11 of the 200 apartments are currently occupied. Another 20 units are pre-leased and ready for tenants to move in. The building’s first through third floors are currently finished and open; construction of the building’s fourth through seventh floors should be done in a matter of weeks.The building contains a mix of studio, one-bedroom, and two-bedroom apartments, which range in monthly rent from $1,950 to $4,000, according to the Anthem’s website. Per a development agreement with the city, the complex also includes 40 apartments set aside for renters making between 50 and 100 percent of the area median income (AMI), which currently translates to between $50,050 and $116,100 for a family of four.The 200-unit development cost around $76 million to build. It also includes 15,000 square feet of ground-floor retail space — which, come next spring, should be occupied by a down-sized Elm City Market grocery store, a Common Grounds cafe, a restaurant called The Melting Pot, and a yet-to-be-announced fourth commercial tenant.This now-opened building marks ​“the very start of a new, transformative neighborhood” in New Haven, city Economic Development Administrator Mike Piscitelli said on Monday morning at a celebratory press conference and ribbon cutting.After years of delays with a previous developer, Spinnaker took over the redevelopment project in 2019. They began construction in 2022.Caico noted that this is just the first building in a multi-phase development. As detailed in the developer’s agreement with the city, there will also be a 500-plus-space parking garage and 150 to 200 more apartments built along State Street as part of ​“Phase 1B.” Then ​“Phase 2” will likely include another 200 apartments.And that’s not to mention the 11-story lab and office building that a company called Ancora plans to build right next door at the southwestern corner of the ex-Coliseum lot.“It’s been a long journey,” Mayor Justin Elicker said, and there’s still plenty to come at this site. But Monday’s celebration of the opening of the first building marks quite a milestone, he said, in the city’s long-in-the-works effort to bring this long-empty lot back to life.After the presser, Alves walked reporters and photographers through the first and second floors of the building.A Stratford resident and native of Springfield, Mass., he showed off the fitness center, the pool, the common area with a plant wall and lamp shades made of mushrooms and lighting fixtures decorated with moss amidst the building’s mix of concrete and metal.He said that, decades ago, he used to head down from Massachusetts to New Haven to visit friends and go to concerts and monster truck shows at the Coliseum. That was ​“a long time ago,” he reminisced. Any memories from the Aerosmith or Huey Lewis concerts he attended? ​“Nothing you should print in the paper,” he replied.The Anthem at Square 10, with "laneway" and plaza. This lamp shade is made of mushrooms! Lift and swim, lift and swim. Caico (center) with Mike Piscitelli and Ginny Kozlowski: Ribbon cuttings are a time to celebrate, and to say thank you to everyone who helped along the way. The venue that was.