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Radio magnetars are exotic sources noted for their diverse spectro-temporalphenomenology and pulse profile variations over weeks to months. Unusual forradio magnetars, the Galactic Center (GC) magnetar $\rm PSR~J1745-2900$ hasbeen continually active since its discovery in 2013. We monitored the GCmagnetar at $\rm 4-8~GHz$ for 6 hours in August$-$September 2019 using theRobert C. Byrd Green Bank Telescope. During our observations, the GC magnetaremitted a flat fluence spectrum over $\rm 5-8~GHz$ to within $2\sigma$uncertainty. From our data, we estimate a $\rm 6.4~GHz$ period-averaged fluxdensity, $\overline{S}_{6.4} \approx (240 \pm 5)~\mu$Jy. Tracking the temporalevolution of $\overline{S}_{6.4}$, we infer a gradual weakening of GC magnetaractivity during $2016-2019$ relative to that between $2013-2015.5$. Typicalsingle pulses detected in our study reveal marginally resolved sub-pulses withopposing spectral indices, a feature characteristic of radio magnetars butunseen in rotation-powered pulsars. However, unlike in fast radio bursts, thesesub-pulses exhibit no perceptible radio frequency drifts. Throughout ourobserving span, $\rm \simeq 5~ms$ scattered pulses significantly jitter withintwo stable emission components of widths, $\rm 220~ms$ and $\rm 140~ms$,respectively, in the average pulse profile.

$\rm 4-8~GHz$ Spectro-temporal Emission from the Galactic Center Magnetar $\rm PSR~J1745-2900$