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partially grouted cmu walls

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what is the concencus about the seismic performance of partially grouted cmu 
walls?  the subject building is a two story rectangular shaped structure, 
with concrete slab on deck second floor and wood framed roof.  It is located 
in Los Angeles, and was constructed in 1959.  There is a good distribution of 
solid interior and perimeter walls with few openings, and the block is in 
very good condition.  The walls are 8" block walls with vertical steel at 24" 
o/c, and only block cores with verticals are grouted.  There is a horizontal 
bond beam at the second floor and roof, but other wise no horizontal steel.  
How is the shear capacity of this type of system evaluated?  Is it considered 
similar to a URM building?

thanks - paul franceschi