Left: location of 3D-HST GS30274 in the stellar mass vs. SFR plane of galaxies. The grey dots show galaxies taken from all five 3D-HST/CANDELS fields (Momcheva et al. 2016) in the redshift range 2.0 < z < 2.5. The black line show a fit to the these galaxies from Whitaker et al. (2014). The source in this study, 3D-HST GS30274, shown as a red diamond, lies on top of the main-sequence of galaxies at these redshifts, at the high-mass end. Right: size-mass relation of galaxies with redshifts 2.0 < z < 2.5 from the five 3D-HST/CANDELS fields (Momcheva et al. 2016; van der Wel et al. 2014). The solid lines define the van Dokkum et al. (2015) selection criteria for compact, massive galaxies: log (M_∗/M_⊙) > 10.5 and log (r_e/ kpc) < log (M_∗/M_⊙)−10.7. 3D-HST GS30274 is shown as a red diamond and falls within the area for compact, massive galaxies.