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The empirical relations in the black hole-accretion disk-relativistic jetsystem and physical processes behind these relations are still poorlyunderstood, partly because they operate close to the black hole within thecentral light year. Very long baseline array (VLBA) provides unparalleledresolution at 15 GHz with which to observe the jet components atsub-milliarcsecond scales, corresponding to sub-pc-scales for local blazars. Wediscuss the jet inner structure of blazars, location and radiation mechanismsoperating in the innermost parsec-scale region of blazars, and evidence forjet-excited broad-line region (BLR) ouflowing downstream the jet. OutflowingBLR can provide necessary conditions for production of high energy emissionalong the jet between the base of the jet and the BLR and far beyond the BLR asevidenced by recent observations. Flat spectrum quasars and low synchrotronpeaked sources are the most likely objects to host the outfllowing BLR. Fromthe $\gamma$-ray absorption arguments, we propose that the jet-excited regionof the outflowing BLR in quasars is small and/or gas filling factor is low, andthat the orientation and opening angle of the outflowing BLR can lead torelevant $\gamma$-ray absorption features observed in quasars.

The central pc-scale region in blazars: insights from multi-band observations