Lord venkateswara is the supreme avatar of Maha vishnu in this kaliyug as per vedas, puranas, hindu dharma. All avatars are Rama , krishna etc are other forms of this lord balaji only.
When you see this gopuram itself, your heart goes with lord venkateswara. His Devine attraction starts you to run to Him.Starting of seven hills from this gopuram. The abode for all hindu gods.