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We report observations of CO(J=2-1) and CO(J=3-2) line emission towards thequadruply-lensed quasar RXS J1131-1231 at z = 0.654 obtained using the Plateaude Bure Interferometer (PdBI) and the Combined Array for Research inMillimeter-wave Astronomy (CARMA). Our lens modeling shows that the asymmetryin the double-horned CO(J = 2-1) line profile is mainly a result ofdifferential lensing, where the magnification factor varies from ~3 to ~9across different kinematic components. The intrinsically symmetric line profileand a smooth source-plane velocity gradient suggest that the host galaxy is anextended rotating disk, with a CO size of R_CO~6 kpc and a dynamical mass ofM_dyn~8x10^10 Msun. We also find a secondary CO-emitting source near RXSJ1131-1231 whose location is consistent with the optically-faint companionreported in previous studies. The lensing-corrected molecular gas masses areM_gas = (1.4+/-0.3)x10^10 Msun and (2.0+/-0.1)x10^9 Msun for RXS J1131-1231 andthe companion, respectively. We find a lensing-corrected stellar mass of M_* =(3+/-1)x10^10 Msun and a star formation rate of SFR_FIR = (120+/-63) Msun yr^-1, corresponding to a specific SFR and star formation efficiency comparable toz~1 disk galaxies not hosting quasars. The implied gas mass fraction of~18+/-4% is consistent with the previously-observed cosmic decline since z~2.We thus find no evidence for quenching of star formation in RXS J1131-1231.This agrees with our finding of an elevated MBH/Mbulge ratio of >0.27+0.11%-0.08 compared to the local value, suggesting that the bulk of its black holemass is largely in place while its stellar bulge is still assembling.

Molecular Gas Kinematics and Star Formation Properties of the Strongly-Lensed Quasar Host Galaxy RXS J1131-1231