！
Tokyo Midtown is full of greenery!
Literal
Tokyo Midtown [topic-は] green [subject-が] full!
A tourism/promotional-style exclamation. 緑 ('green') refers to greenery/plants as a collective — common in Japanese descriptions of parks, gardens, and urban green spaces. いっぱい ('full, abundant') is a casual adverb/noun for 'lots of.' Note the verbless ending — a common headline or advertising pattern. The tone is enthusiastic and casual.