  Yrast and near-yrast states above the known 25/2$^{+}$ isomer in $^{207}$At
are established for the first time. The level scheme is extended up to
47/2$\hbar$ and 6.5 MeV with the addition of about 60 new $\gamma$-ray
transitions. The half-life of the 25/2$^{+}$ isomer is revisited and a value of
$T_{1/2}$ = 107.5(9) ns is deduced. Evidence of a hitherto unobserved
29/2$^{+}$ isomer in $^{207}$At is presented. A systematic study of $B(E3)$
values for the transitions de-exciting the 29/2$^{+}$ isomer in the neighboring
odd-$A$ At isotopes suggests a half-life in the 2$-$4.5 $\mu$s range for this
state in $^{207}$At. The experimental results are compared with large-scale
shell-model calculations performed using the KHM3Y effective interaction in the
$Z$ = 50$-$126, $N$ = 82$-$184 model space and an overall good agreement is
noted between the theory and the experiment. A qualitative comparison of the
excited states and the isomers with analogous states in neighboring nuclei
provides further insight into the structure of $^{207}$At.
