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URM Building with Additional work

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Hello fellow Engineers,
I am currently working on a 4-story unreinforced brick building that was 
rehabilitated to comply with Div.88 of  the city of Los Angeles. We are 
now doing some interior remodeling and upgrading utility systems to this 
building. But I am wondering if anybody has worked out something to add 
more strenght and safety to this kind of building besides its compliance 
with Div.88. The building reveals several large cracks on the exterior 
face that were patched up or regrouted with new bricks. 
How about an additional 4-inch thick shotcrete to the exterior face of 
the entire building or new steel frames installed inside the building ?
I would appreciate any information regarding practicality, cost, 
structural capacity, detailing, or general pitfalls when considering 
these alternatives.

Tin Dinh, P.E.

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