einsehbar
visible from outside
Situated or designed in such a way that one can see into or through it; open to view from outside.
Das Grundstück ist von der Straße aus gut einsehbar.
The property is clearly visible from the street.

visible / accessible
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visible from outside
Situated or designed in such a way that one can see into or through it; open to view from outside.
Das Grundstück ist von der Straße aus gut einsehbar.
The property is clearly visible from the street.

The word is made up of 'ein-' (in), the stem of 'sehen' (to see), and the ending '-bar' (-able, possible). So it literally means something like 'possible to see into' and describes that one can see into something.
Durch die großen Fenster ist das ganze Wohnzimmer von außen einsehbar.
Because of the large windows, the whole living room is visible from outside.
The context reveals the meaning: if it is about a physical place (garden, apartment, balcony), visibility is meant. If it is about information (files, data, documents), availability for reading is meant.
Unser Garten ist leider für alle Nachbarn gut einsehbar.
Unfortunately, our garden is clearly visible to all the neighbors.
In the spatial meaning, the perspective is often added with 'von außen' (from outside), 'von der Straße' (from the street), or 'für die Nachbarn' (for the neighbors) to specify who can see in.
Wir suchen ein Grundstück, das nicht direkt von der Straße einsehbar ist.
We are looking for a property that is not directly visible from the street.
When documents or data are involved, the preposition 'für' is often used to indicate who is authorized to view them. The structure is: 'etwas ist für [Person/Gruppe] einsehbar' (something is accessible for [person/group] to view).
Die Protokolle der Sitzung sind für alle Vereinsmitglieder einsehbar.
The minutes of the meeting are accessible to all club members.
open
'offen' and 'einsehbar' can both mean that something is not hidden. However, 'offen' is much more general: a door can be open, and an event can be open to everyone. 'einsehbar' is used more specifically when you can see into something, or when documents, files, or data may be viewed. So 'einsehbar' is more strongly about visibility or access to information.

Die neuen Arbeitszeiten sind ab heute im internen System einsehbar.
The new working hours are accessible in the internal system starting today.
Die Tür zum Seminarraum bleibt während der Pause offen.
The door to the seminar room stays open during the break.