The upper part (level-4, 5, 6) of the skyscraper must be printed together.
The plate in level-2 is bendable, you must bend it a bit (you can also use a lighter to make it bend) and insert the upper parts
You will need brim and support. I recommend using the project file.
Adding the advertisments is a bit tedious: Print them and the connectors. Depending on your filament you may also need to adjust the size the connector.
Add the connector to the skyscraper, where you want your advertisment. Then put glue on it and press the advertisment on it.
For the LED name tag, see https://www.amazon.com/dp/B09J3PQYMJ (also added via connector)
The author marked this model as their own original creation.