Corner plot - street to the south and west: building site/carports

Name the original development plan (Caution, not as a link!). In your (too small-scale) excerpt, it is not possible to clearly distinguish what is an official plan and what is additional drawing. The distance of the building boundaries from the property boundaries is unusual. I would also have expected a "Ga/Cp" special building window for a corner plot.

I also come to 480 It is 25.24 * 19 (5+16+4.24) * (14+5)

I also come to 480 It is 25.24 * 19 (5+16+4.24) * (14+5)

Then you ignore the 6.09m at the top right. That comes to 633 sqm. The question is, are you allowed to place the carport and storage room outside the building window?

Intentionally;

The property consists of two parts

...not three.
From the rest of the description, it can actually only be concluded that the two properties are meant in the calculation.
But yes, both the sketch and the description allow for a lot of interpretation...

Intentionally;

...not three.
From the rest of the description, one can basically only conclude that the two plots are meant in the invoice.
But yes, both sketch and description leave a lot of room for interpretation...

Yes, 2 plots. I see no room for interpretation there.

What would also be interesting to know: Is it allowed to access from both streets?