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However, different observational setups can affect these lines, and the derivation of the physical nebular properties. We analyze 12 local star-forming galaxies from the COS Legacy Spectroscopy SurveY (CLASSY) to assess the impact of using different aperture combinations on the determination of the physical conditions and gas-phase metallicity. We compare optical spectra observed with the Sloan Digital Sky Survey Data Release aperture, which has a 3\u2033 diameter similar to COS, IFU, and long-slit spectra, including new LBT\/MODS observations of five CLASSY galaxies. We calculate the reddening, electron densities and temperatures, metallicities, star formation rates, and equivalent widths (EWs). We find that measurements of the electron densities and temperatures, and metallicity remained roughly constant with aperture size, indicating that the gas conditions are relatively uniform for this sample. However, using IFU observations of three galaxies, we find that the <jats:italic>E<\/jats:italic>(<jats:italic>B<\/jats:italic> \u2212 <jats:italic>V<\/jats:italic>) values derived from the Balmer ratios decrease (by up to 53%) with increasing aperture size. The values change most significantly in the center of the galaxies, and level out near the COS aperture diameter of 2.\u20335. We examine the relative contributions from the gas and stars using the H<jats:italic>\u03b1<\/jats:italic> and [O <jats:sc>iii<\/jats:sc>] <jats:italic>\u03bb<\/jats:italic>5007 EWs as a function of aperture light fraction, but find little to no variations within a given galaxy. 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