Bustling Koreatown has been on a building boom as of late, and a parcel just north of Wilshire Boulevard wants to get in on the action.  "The Nest," a self-described apartment-hotel development, intends to replace a surface parking lot at 621 Catalina Street with 75 hotel rooms and seven apartment dwellings.  Residences and guest rooms would rise above approximately 1,500 square feet of ground floor commercial space, intended for a small cafe or store.  The six-story structure, designed by K-Town based EWAI Architecture, would be clad in plaster, corrugated metal paneling and stone veneer (Anti-Stucco Avengers, rejoice!).  On site amenities include a 1,500 square foot fitness center, an internal courtyard, and a 91-vehicle underground garage.  Located just a few blocks from Metro's Wilshire/Vermont Station, the apartment-hotel project sits within a densely populated neighborhood, rich with transit and affordable eateries.  Guests and residents could walk down Vermont Avenue for some $10 all-you-can-eat Korean Barbeque at Ma Dang Sae, or take a subway ride Downtown to enjoy "America's Next Great City" and it's thriving bar scene.  The Nest is scheduled to break ground in 2015, with construction anticipated to last two years.