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The purpose of this note is to extend the results obtained in[arXiv:1303.6970] in two ways. First, the six-dimensional F-theorycompactifications with U(1) x U(1) gauge symmetry on elliptic Calabi-Yauthreefolds, constructed as a hypersurface in $dP_2$ fibered over the base$B=\mathbb{P}^2$ [arXiv:1303.6970], are generalized to Calabi-Yau threefoldselliptically fibered over an arbitrary two-dimensional base B. While therepresentations of the matter hypermultiplets remain unchanged, theirmultiplicities are calculated for an arbitrary B. Second, for a specificnon-generic subset of such Calabi-Yau threefolds we engineer SU(5) x U(1) xU(1) gauge symmetry. We summarize the hypermultiplet matter representations,which remain the same as for the choice of the base $B=\mathbb{P}^2$[arXiv:1306.3987], and determine their multiplicities for an arbitrary B. Wealso verify that the obtained spectra cancel anomalies both for U(1) x U(1) andSU(5) x U(1) x U(1).

F-Theory Compactifications with Multiple U(1)-Factors: Addendum