Suggestions(1)
The phrase "are structures" is grammatically correct and can be used in written English.
It is typically used when discussing the composition or organization of something. Example: "The company's marketing strategies are structures that have been carefully designed to attract new customers."
Dictionary
are structures
noun
A cohesive whole built up of distinct parts.
Exact(60)
The life of these buildings are not purely dictated by demographics, planning requirements or structural issues... they are structures with their own emotional life story.
There are structures there.
They are structures of pretence and willed ignorances.
Mitochondria are structures in cells that produce cellular energy.
"These are structures that are performing themselves in their forms," he said.
Between those colonial shells are structures that are already drawing expatriates, artists and tourists.
"In Istanbul and Ankara, there are structures that have gone against the characters of both cities.
"In general," she said of airports, subways and highways, "these are structures for characteristic human behavior to be played out.
And in the playgrounds, there are structures that would compel American lawyers to fight for adjacent office space.
Constant to all such cases are structures where men have power and women are not seen as credible.
True, there are structures like the Eiffel Tower, which at first seemed shocking and in time became icons.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com