Rendering by SHoP Architects  On First Avenue between 35th and 36th Streets, sat 9.2 acres of undeveloped, muddy land for several years. The owner of the former ConEd site, developer Sheldon Solow, had planned on building two apartment towers. Last year, he sold the property for $172 million to JDS Development, who is following through with Solow’s plans. The Midtown East mud pit is in the process of transforming into two SHoP Architects-designed luxury rental towers, one at 40 stories and the other at 49 stories, housing a combined 800 luxury apartments for rent.