Street artist Daniel Anguilu hopes to cover the entire surface of this 4-story Midtown building with his distinctive animal-friendly murals. Anguilu — also known by his nom-de-spray, weah — began painting the former Mental Health and Mental Retardation Authority building at 2850 Fannin St. in June. But it’s not exactly a stealth project: Anguilu was invited to take on what he’s calling the Public Decor Project by commercial real-estate broker Adam Brackman, whose family owns the building. And Brackman’s been providing him with mistinted no-VOC paint from New Living, the Rice Village green-home-supplies store where Brackman’s a partner.