Roof terrace, balcony & laundry drying

Roof terrace with a roof cover - not required, up to the architect (originally planned to do the BBQ here; now the gathering area could move downstairs).

AC outdoor units that are not noisy, durable and safe.

Planting on the balcony. Plants on the balcony and roof terrace: build planters or buy loose pots? If large planters are built, how should they be waterproofed? The household has little time for cleaning - should a balcony be built at all?

Washing - drying - hanging laundry on the ground floor, back yard. Leave a water line up to the top floor in advance, in case of a change of mind later.

Exterior walls without stains from rain water - what solution?

Overflow drain pipes on the roof terrace, outdoor area upstairs, balcony: not sure the household will be diligent enough to clean the drain pipes, leaves may clog them - what solution?