architektonisch
architectural
Relating to architecture, that is, the art and science of designing and constructing buildings.
Das neue Museum ist ein architektonisches Meisterwerk der Moderne.
The new museum is a modern architectural masterpiece.

architectural
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architectural
Relating to architecture, that is, the art and science of designing and constructing buildings.
Das neue Museum ist ein architektonisches Meisterwerk der Moderne.
The new museum is a modern architectural masterpiece.

'Architektonisch' (architectural) is the adjective belonging to the word family around 'die Architektur' (architecture, the art of building) and 'der Architekt' (architect, the person). The ending '-isch' forms the adjective from the noun here.
Sie studiert Architektur, weil sie sich für architektonische Fragen interessiert.
She is studying architecture because she is interested in architectural questions.
This adjective usually describes aspects of buildings or their planning. Common combinations are 'ein architektonisches Meisterwerk' (an architectural masterpiece), 'eine architektonische Herausforderung' (an architectural challenge), or 'architektonische Details' (architectural details).
Die Elbphilharmonie in Hamburg ist eine architektonische Attraktion.
The Elbphilharmonie in Hamburg is an architectural attraction.
The word can stand before a noun or be used as an adverb to comment on a quality. The adverbial use is very common for evaluating the quality of a design.
Das ist ein architektonisch sehr ansprechendes Gebäude.
That is an architecturally very appealing building.
structural
'baulich' and 'architektonisch' both have to do with buildings and construction. 'baulich' is used more for practical or technical things related to a building, for example its condition, defects, changes, or measures. 'architektonisch' fits better when it is about planning, design, style, or the special form of a building. Learners can confuse the words because both occur in the context of buildings. As a guide: 'baulich' is more about what is done or changed in the construction; 'architektonisch' is more about how a building is designed or shaped.

Das Museum ist architektonisch besonders interessant, weil es ganz aus Glas gebaut ist.
The museum is especially interesting architecturally because it is built entirely of glass.
Vor dem Umzug müssen noch einige bauliche Mängel im Haus behoben werden.
Before the move, several structural defects in the house still need to be fixed.