ONE RINCON HILL -- or 425 First Street is a residential complex that is currently under construction on the apex of Rincon Hill in San Francisco. The complex, designed by the Chicago architectural firm Solomon, Cordwell, Buenz and Associates, includes townhouses and two highrise condo towers, with the One Rincon Hill North Tower being 49 stories and 541 ft. (165 m), and the One Rincon Hill South Tower being 60 stories tall and 641 ft. (195 m). The developer of this complex is Urban West Associates. The sloped nature of the Rincon Hill site means that the lobby floor or the First Street entrance is at floor 5 and floor 1 is two levels below ground. Adding on the height of Rincon Hill, at about 120 ft. (37 m), the total height of the tower is 761 ft. (232 m) above sea level, offering spectacular views. In addition to the views, there will be many luxurious offerings included in the complex like a swimming pool. Upon completion and due to its height, this will be the most significant addition to the San Francisco skyline in over 30 years and the tallest all-residential tower west of the Mississippi River. The total cost of the project is $290 million. -- wikipedia