  Centimeter-sized single crystals of Sr$_{1.5}$La$_{0.5}$RhO$_{4}$ were grown
by the floating zone method at oxygen pressures of 20~bar. The quality of our
single crystals was confirmed by X-ray Laue, powder and single crystal X-ray
diffraction, neutron and X-ray absorbtion spectroscopy measurements. At
$\sim$50% electron doping we observe RhO$_3$ octahedral rotations of
$\sim$8.2$^{\circ}$ within the octahedral basal plane which are incompatible
with space group I4/mmm. Our single crystal was further characterized by
susceptibility, electrical transport and, finally, specific heat measurements
showing a temperature dependent Debye temperature.
