The phrase "are to exist at" is correct and usable in written English.
It can be used to indicate a future state or condition where something is expected to be present or occur at a specific location or time.
Example: "The new facilities are to exist at the designated site by the end of the year."
Alternatives: "are expected to be at" or "are meant to be located at".
What would be scary for me is to exist at the Trump Organization in a minor capacity.
By helping people to experience "science" in new ways, in unexpected places and with the quirkiest of collaborators, we hope to inspire them to reflect on the complexity of their lives and how remarkable it is to exist at all.
Staten Island's special misfortune is to exist at a point where somewhat ambiguous but real corporate crime helped to provide a market opportunity for straight-ahead drug-cartel crime.
Curious things happen in these stories – characters mysteriously disappear, ironing boards become animate and walk out of apartments, a woman wakes up to find a breast has grown on her back – but their main subject seems to be how strange it is to exist at all.
In the wrongful life case, a child is born with a serious genetic or chromosomal impairment, an impairment that is unavoidable if the child is to exist at all.
If frozen or glass-like particles were to exist at these altitudes, their coalescence properties would differ from those of liquid sulfuric acid, and hence, the expected size distributions of the cloud particles may vary.
Feeling powerless because you don't understand something can be easily remedied, but feeling powerless because those in positions of power don't feel your situation deems remedy, or even recognizes it as a situation at all, is to exist, at best, as an afterthought.
Even if private prisons account for a relatively small proportion of the prison population, that they are allowed to exist at all is an indictment of our system.
Or if problems are acknowledged to exist at home, they are often blamed entirely on outside forces.
Likewise with existence: to say that Julius Caesar possibly existed is to say that Julius Caesar existed at some possible world, and to say that Julius Caesar actually existed is to say that Julius Caesar existed at the actual world.
