"Addition" shall mean adding gross square feet to an existing development project or building subject to this chapter.

"Affordable housing" shall mean the total cost of monthly housing payments does not exceed thirty percent of gross household income.

"City manager" shall mean the city manager of the city of Petaluma or his/her designee.

"Director of community development" shall mean the director of community development for the city of Petaluma, his or her designee, or such person as the city manager may designate.

"Expanded nonresidential development" or "expanded nonresidential development project" shall mean construction that results in a net increase in the gross square footage of an existing nonresidential space or any conversion of residential space to nonresidential space.

"Gross square feet" or "gross square footage" shall mean the area included within the surrounding walls of a nonresidential development. This area does not include enclosed parking for vehicles.

"Low- and moderate-income" shall mean a household with total annual income between eighty percent and one hundred percent of the area median income, adjusted for family size, and in accordance with the Area Median Income Schedule as published annually by the U.S. Department of Housing and Urban Development for the Santa Rosa MSA.

"Nexus Study" shall mean the "Sonoma County Workforce Housing Linkage Fee Study" published by Economic and Planning Systems, Inc., in December 2001 as may be amended from time to time.

"Nonresidential development" or "development project" for purposes of this chapter shall mean any project resulting in new or expanded nonresidential gross square footage.