Not necessarily a mistake or anything definitive as far as CPP is concerned because of the poster that correctly identified the building material as an anchor plate which can be dated as part of the structure of the building...

However, these anchor plates are obviously, pentagonal stars, probably very common in DC, BUT/AND are still MASONIC in nature and therefore still represent very strong symbology in DC and the PG Saga...

AND, most likely only embellished Alefantis' desire for the facility.

http://store.alliedbolt.com/ststburewa.html

I would up vote this if it were pictures of pedophilia logos like the heart, triangle/swirl, Butterfly, or an illuminati or freemason symbol.

They look like the Eastern Star.

Those are anchor plates.

Anchor plate | Wikipedia

... Anchor plates are used on exterior walls of masonry buildings, for structural reinforcement. Being visible, many anchor plates are made in a style that is decorative. One popular style is the star anchor — an anchor plate cast or wrought in the shape of a five-pointed star. Other names and styles of anchor plate include earthquake washer , triangular washer , S-iron , and T-head . In the United Kingdom, pattress plate is the term for circular restraints, tie bar being an alternate term for rectangular restraints.*

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Anchor plate | Wikiwand

... They are easy to find in cities with substantial legacies of 18th- and 19th-century brick construction, such as New York, Philadelphia, St. Louis, Cincinnati and Charleston, South Carolina, and in older earthquake prone cities such as San Francisco, as well as across all of Europe. The tie-rod-and-plate assembly braces the masonry wall against lateral bowing. ...

Oh wow, that surely qualify as evidence showing that Alefantis and CPP staff are raping and murdering children in satanic rituals.

I would pity you insane conspiratards if I wouldn't be simply disgusted by you.

non-imgur link: https://files.catbox.moe/862jkv.jpg

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The upside-down star/pentagram has long been recognized as the symbol of Satan. Anton LaVey, author of the Satanic Bible and The Satanic Rituals, lavishly used this symbol in his ceremonies and rituals–most often depicted as the "goat’s head." A Short Guide to Occult Symbols: "Pentacles and Pentagrams" by Carl Teichrib