Rights of First Floor Owner in 3-storeyed residential building

Respected Property Lawyers, I am an owner of first floor in a 3 storeyed 350 sq ft (approx) corner house. The builder of the house also owns and resides at the ground floor and the basement of the house. There are several doubts in my mind which I want to resolve seeking your guidance: 1. He has put a lock on the terrace and does not allow my family to use it without asking him for the key everytime. He sticks to his decision by replying that only top floor (which is vacant as of now) has the right to use the terrace inspite of the fact that all the water tanks of all 3 floors are placed on roof. 2. He keeps on constructing one thing or the other outside ground floor such as: (a) L shaped garden around the corner of the house which blocks the vision of commuters taking turns as it is a corner house in locality. Now the questions arises what are the rights of a First floor owner against such actions? How do I resist the Ground floor owner from such violations?