Three towers proposed between Northeast First and Second avenues in downtown Miami could add 1,083 residential units if plans being floated by the developers of the sprawling Miami Worldcenter come to fruition.

That number of units culled from detailed architectural plans released by the developer this week would represent a significant bump in an area that the city estimates holds fewer than 12,500 households.

In a July study, the city’s Downtown Development Authority estimated just over 23,000 residents live in Miami’s core bounded by the Miami River, Biscayne Bay, Northwest Third Avenue and 17th Street and excluding the historic Overtown neighborhood.

The proposed residential construction would further run up the tally of future units for the projects announced during the current development cycle, which stood at more than 3,100 before the Worldcenter developers released details of their plans.

The architectural blueprints, surveyor’s drawings and artist’s renderings provided to the Daily Business Review will be part of an upcoming permit process showing three towers rising above the retail complex Miami Worldcenter plans between the Florida East Coast railroad tracks and Northeast 10th Street.

Buildings with unique architectural character have varying levels of amenities. At least two towers have direct access to a 10th-floor terrace, which is envisioned as a large rooftop green space with potential restaurants and other features.

The first tower, designed by Coral Gables architects Nichols Brosch Wurst Wulf & Associates Inc., would have 47 floors and be just over 537 feet tall. About 338 residential units would share space with a 235-room hotel in the thin urban tower whose design is reminiscent of pre-recession towers built nearby before the recession. A restaurant with a rooftop deck is envisioned on top.

The second and biggest residential tower would have 466 units, including four penthouse duplexes on the 54th floor. A rooftop lounge and pool would be on the highest level of the sleek glass-and-steel spire. The so-called Worldcenter Signature Tower, drawn by Boston-based Elkus Manfredi Architects, is planned at over 700 feet tall.

The third residential tower, designed by Miami-based ADD Inc., would fit 289 apartments on a half-moon-shaped footprint. The 34-story tower is closer to concepts floated for bayfront buildings in Coconut Grove than those previously seen in downtown Miami.

A completion date for the residences has not been announced, but the developer has said it plans to begin Worldcenter later this year. Each tower must receive approval from the city and the Federal Aviation Administration.

Downtown Miami is currently booming with plans for various residential projects, including:

• Centro, a 352-unit loft-style condo development under construction at 151 SE First St.

• Flagler on the River, a 300-unit tower under construction at 356 W. Flagler St.

• Melody, a 497-unit rental project under construction at 245 NE 14th St.

• Montage at Met 3, a 462-unit apartment building under construction at 200 SE First St.

• One Thousand Museum, a 99-unit ultraluxury tower offering pre-construction contracts at 1000 Biscayne Blvd.

Additionally, developer Tibor Hollo plans to build 640 residential units at his proposed One Bayfront Plaza at 100 S. Biscayne Blvd. Chateau Group is planning a large residential project east of Miami Worldcenter, but details have not been released. Resorts World Miami is paving the way for 1,000 units on the site of the old Miami Herald building.

Plans also are being marketed for several riverfront lots south of Flagler Street and for 300 Biscayne Blvd. Florida East Coast Industries also is planning a residential component at the All Aboard Florida station complex.