Welcome to 313-23 E. 21st Street in Costa Mesa's premier Eastside submarket. This 24,600 Sq. Ft. (.56 AC) parcel has a detached 4-Bedroom/3-Bathroom Single Family Residence with a 1-Bedroom casita and attached Double Garage. The house has extensive remodeling with hardwood floors throughout and highly upgraded appliances. The casita can easily be converted into an official 1-Bedroom ADU with its private yard and parking. The five (5) apartment units are comprised of (1) massive 1-Bedroom/1-Bathroom units with their own attached garage and private yard, and (4) 2-Bedroom/1-Bathroom units, three of which are single stories. One of the 2-Bedroom units is completely detached with its own private yard, and the 2-Bedroom units are over garages. Each unit also has(1) single-car garage and (1) open space. All units have recently been painted with new facia boards and new landscaping and all of the units have undergone renovations in this pride of ownership property.