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The Portland Design Commission got its first look on Thursday at plans for a two-story events center proposed for the Lloyd Center site.

The 67,000-square-foot venue would host concerts and other live events. It鈥檚 part of a long-term plan to remake the Lloyd Center and the surrounding district.

Owner and developer Urban Renaissance Group, based in Seattle, decided to move ahead with the land-use case for the building even as a Central City master plan for the Lloyd District is following closely behind.

URG proposes to demolish the existing former Nordstrom store structure and tear down a sky-bridge to build the events center. The building鈥檚 east end would abut the mall.

At Thursday鈥檚 design advice hearing, commissioners said the project could produce an 鈥渋conic鈥� building in the central city but raised several questions.

鈥淭his is a project that the city absolutely needs,鈥� Commissioner Sam Rodriguez said. 鈥淲e need things that will bring people downtown, and things like this will absolutely help.鈥�

Commissioners questioned the Works Progress Architecture design team on the use of polycarbonate panels and requests for two modifications to design standards.

Works Progress is asking to be relieved from the city鈥檚 clear vision glass requirement so it can instead use translucent polycarbonate panels to block light from outside the venue and keep sound from leaking to the property line.

The design team is also asking for a steep reduction in the eco-roof requirement that mandates 60 percent of surface area be covered in green-roof materials. Work Progress is proposing a 15 percent eco-roof, paired with ground-level stormwater planters.

Commissioners and Carrie Strickland, founding principal of Works Progress, wrestled with how to apply design guidelines meant for office, multifamily and retail buildings with active ground-floor frontages to a proposed concert and events venue.

鈥淚t鈥檚 difficult to fit a building like this into the design guidelines that we have,鈥� Commissioner Tina Bue said. 鈥淗owever, I think the design guidelines can be used in a really creative way to elevate the public realm aspect of this building when it鈥檚 not in active use.鈥�

Strickland said the team鈥檚 requests derive from the building鈥檚 intended use. The lack of ground-floor windows, for example, is due to the need to deaden sound. City rules require low-frequency sound to stay below 55 decibels at the property line.

The building needs solidity to achieve that performance, Strickland said.

鈥淚t鈥檚 all mass,鈥� she said. 鈥淵ou can鈥檛 kill a bass sound with a piece of glass.鈥�

Similarly, the applicant鈥檚 request to slip the eco-roof standard comes from structural needs. Sound vibrations will affect the load of roof trusses. That led the project team to seek to move the weight of an eco-roof down to ground-level stormwater planters.

鈥淲e鈥檝e placed the green roof everywhere we can without complicating the function of the long span or the mechanical systems,鈥� Strickland said.

City planner Tim Heron and design commissioners said the design team should work with the Bureau of Environmental Services to achieve a workable solution.

Krista Bailey, URG鈥檚 vice president of development and construction, declined to comment on the project when reached.

Works Progress has designed several other concert venues, including Mission Ballroom in Denver, Epic in Orlando, Florida, and MainPlace in Santa Ana, California.

Works Progress has had discussions with ZGF, which is designing the future Lloyd District, to ensure plans for the events center mesh with the larger Central City master plan.

鈥淲e are in communication with the design team for this Nordstrom site,鈥� ZGF principal Nolan Lienhart said.