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The calculated story drift for each retrofitted story shall not exceed the allowable deformation compatible with all vertical load-resisting elements and 0.025 times the story height. The calculated story drift shall not be reduced by the effects of horizontal diaphragm stiffness but shall be increased where these effects produce rotation. Drift calculations shall be in accordance with the building code.
[BS] A403.4.1 Pole Structures
The effects of rotation and soil stiffness shall be included in the calculated story drift where lateral loads are resisted by vertical elements whose required depth of embedment is determined by pole formulas. The coefficient of subgrade reaction used in deflection calculations shall be based on a geotechnical investigation conducted in accordance with the building code.

Related Code Sections

A403.4 Guidelines for the Seismic Retrofit of Existing Buildings, Story Drift Limitations
The calculated story drift for each retrofitted story shall not exceed the allowable deformation compatible with all vertical load-resisting elements ...