When adding new spaces attached to a historical building, there are preservation issues that need to be addressed as part of the plan. Any addition that we do to a historical building, we keep the style of the original continued on to the new. In some cities, there are regulations that require the the addition to be built in such a way that if the addition was removed, no damage would have occurred to the original exterior of the building. This is true for historic additions in Palo Alto.