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Recent coordinated observations and interpretations of disparate messenger `signals' from GW170817-GRB170817A- EM170817 have inaugurated the era of multi-messenger transient gravitational wave (GW) astronomy. I will argue that the bright blazar OJ 287 should allow us to pursue persistent multi-messenger GW astronomy during the era of Square Kilometer Array. This is mainly due to the several successful multi-wavelength observational campaigns that allowed us to establish the presence of a spinning supermassive black hole binary that spirals in due to the emission of nano-Hertz GWs in the central engine of a unique blazar OJ287. Our on-going efforts, relevant to both the Event Horizon Telescope consortium and the International Pulsar Timing Array consortium which aims to detect GWs from such massive BH systems in the coming years, will be also listed.