Two unions — the Building and Construction Trades Council of Alameda County, a child organization of the American Federation of Labor and Congress of Industrial Organizations, or AFL-CIO, and the Northern California Carpenters Regional Council — have appealed the approval of a use permit for a proposed housing development geared toward UC Berkeley students. The development, which was proposed by Yes Community Architects, will be located at 2425 Durant Ave. The complex will be 20 stories and 208 feet tall, consisting of 169 multifamily apartments for campus students. The City of Berkeley and the Zoning Adjustments Board, or ZAB, approved the project’s use permit at a hearing Oct. 9. Yes Community Architects has requested concessions, or modifications of development standards that reduce the cost of providing affordable housing. The concessions would enable the company to build more units than what is usually allowed under the California State Density Bonus Law, or SDBL. The company ha...