A seven-story mixed-use building for Allentown’s riverfront neighborhood that was tabled by the city’s planning commission in March received conditional approval Tuesday.

The RS Residences at 51 N. Front St. would have 210 units — 43 studios, 115 one-bedroom, 47 two-bedroom and five three-bedroom apartments — with 4,500 square feet of ground-floor retail space and 271 interior parking spaces.

It is part of an ambitious plan by developer Urban Residential Properties to construct four buildings that would add more than 1,000 apartments and 57,000 square feet of retail space to the area along the Lehigh River. The developer also is close to completing the Neuweiler Lofts in the area that will have 283 units.

The RS Residences project is on a 1.5-acre parcel used for overflow parking for the America on Wheels museum. Urban Residential bought it in September for $1.75 million.

Planners had Urban Residential come back because of the building’s “squarish design” and wanted some architectural variety such as recesses, the addition of a cornice and more windows on the first-floor south elevation to create an active street presence.

Revisions included replacing decorative metal paneling with punched windows to prevent headlight glare from the parking garage. Commission members were pleased with undulations and porch accents that improved the building’s aesthetic.

“You were familiar with the building that we had before, it was very flat, very modern,” said Urban Residential’s architect, Carlos Tovar from Diseno Urbano. “I feel it was appropriate to remodel the stone veneer on the ground floor, you know, thinking about connection with the river.”

Commission Chair Christian Brown was concerned about the use of a patch of city-owned land in front of the building that could be used as public outdoor space.

“The thing that this project is missing is there is no real outdoor space,” Brown said. “There’s no grand plan. That should be a grand plaza with a fountain or something, not a parking lot.”

Tovar said the developer is willing to work with the city to put something there.

Another seven-story mixed-use building, the Park Lofts, will be built by Urban Residential next door at 115 Riverside Drive. That project was approved by planners in March.