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Seismic Upgade of Older Structue

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I have been asked to investigate an existing one story commercial building with dimensions of 31’x 124’ and a wood framed roof and exterior concrete walls. No plans are available, but documentation indicates the building was built in the 1920’s. The structure is in Southern California.

 

The owner wishes to seismically upgrade the building to meet current code standards, (2007 CBC). There are existing materials such as 1x straight roof sheathing which has no value in the current code. Am I allowed to use values for existing materials such as those found in the old 1997 UCBC, (Table A-1-D), or maybe values found in some other codes such as the Historic Building Code, or are these values no longer valid since these codes are obsolete?

 

Thanks in advance,

 

Larry Hauer S.E.