The Capitol Area Development Authority began an environmental review this week for a $43 million, mixed-use building proposed for the East End Gateway. While a consultant began the environmental analysis of the project's final design, developers Em Johnson Interest of San Francisco and Nehemiah Community Reinvestment Fund Holdings of Sacramento have begun working with the authority to draft a development agreement for the project at the northwest corner of 16th and N streets. CADA ended its partnership with the first developer, Lambert Development, after that company's proposal was deemed too high-end for Sacramento and progress wasn't made fast enough, said Marc de la Vergne, the author