Here are some architectural functions and features to be considered when planning a building expansion project.  This article from Healthcare Building Ideas.

During design, carefully review the building’s joints to make sure proposed connection methods are feasible and do not create unexpected floor conditions.

Some older buildings are “grandfathered” and do not comply with current seismic code requirements to accommodate additional floors, even if originally designed for additional floors under previous codes. Reinforcing this structure could require exposing and reinforcing existing columns or adding new underground footings in occupied areas of the facility.

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