Holman Gardens, at 6309 NE MLK, is one of two places on the Boulevard that have been listed on the National Register of Historic Places:
Holman Gardens, designed by architect Carl Linde, was constructed in 1928 as an apartment building and is now a condominium building called Clovelly Garden Apartments. This name change contributes to some confusion, as seen on this website that talks about Carl Linde and some of his Portland designs.
According to wiki, “The National Register of Historic Places (NRHP) is the United States government’s official list of districts, sites, buildings, structures, and objects deemed worthy of preservation. Having a property on the NRHP makes its owners eligible for tax incentives for expenses incurred preserving the property if they are offered by the local taxing districts.”
The info plaque on the left that’s on the front of the building is almost completely faded.