Here are is an example of an architectural response to an existing site condition (a topographical edge). I thought this might be useful as your sites are all slightly unusual.
A new space is inserted here, but also a new type of connection created between the two levels. Intertesting for you at this stage is maybe that there is a formal programme inside the new space (library), and an informal programme above, that is solely generated by the roof. Very resourceful and strategic. LINK