The discovery is detailed in Hiding in Plain Sight: The Discovery of a
New Monumental Structure at Petra,
Jordan, Using WorldView-1 and
WorldView-2 Satellite Imagery Bulletin of the American Schools of Oriental Research No. 375 (May 2016), pp. 35-51 (alternative official link)
"Building" is not the best word, but yes, ruins of buildings have been discover.
A long north–south alignment of walls and
collapsed chambers from a building complex was identified
(Fig. 5, labeled CAT 2); no obvious function could be
determined from this preliminary visit, and the pottery
scatters included materials from the first century b.c.e.
through to at least the third century c.e. A more distinct
structure was also identified nearby (CAT 1). This was
an approximately 14 × 14 m elegant building built on a
small platform with its entrance on the east side; it contained
columns (Fig. 6), pilasters, a flagstone floor, and an external cistern with its cover stone in situ.
...
There is one prominent structure on the interior platform
that is centered north–south but offset to the western
side. It measures 8.5 × 8.5 m, and its entrance was
centered on its east wall, the doorstep of which is still in
situ (Fig. 12). Only a partial single course of wall stones
is preserved above the foundation, and the state of the internal
floor could not be determined without excavation.
The structure’s walls were composed of only a single row of stones, generally laid using a header-stretcher configuration,
which suggests that the building was no more
than one or two stories in height. The small building may
have included at least one column at some point, as a
remnant of a single drum was visible buried outside the
west side (Fig. 13); this drum is smaller than those found
in situ on the east side of the smaller platform.
Yes, on the ground photographs are in the article, not just satellite photos.
