A nanoscale ordered perovskite cobaltite, which consists of 90\ifmmode^\circ\else\textdegree\fi{} ordered domains of the layered ``112'' $\mathrm{La}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{6}$, has been evidenced by high resolution-transmission electron microscopy. This form, such as the disordered ${\mathrm{La}}_{0.5}{\mathrm{Ba}}_{0.5}\mathrm{Co}{\mathrm{O}}_{3}$ and ordered $\mathrm{La}\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{6}$, exhibits a ferromagnetic transition at ${T}_{C}\ensuremath{\approx}179\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. However, it differs from the two previous forms by its strong magnetic anisotropy and, correlatively, by its high value of coercivity $(4.2\phantom{\rule{0.3em}{0ex}}\mathrm{kOe})$ at low temperature. We suggest that this behavior originates from the locking of magnetic spins in the 90\ifmmode^\circ\else\textdegree\fi{} oriented nanodomain. Moreover, one observes a semimetal to semimetal transition at ${T}_{C}$ with a maximum magnetoresistance of $\ensuremath{\sim}6.5%$ at this temperature.