Can Someone open the SAME buiness in my office space? -

I am renting space in an office that has about 5 small offices in one room. I do Brazilian Travel Visas, and he is an immigration lawyer, but saw that I do Brazil Visas, and now he is doing Brazil Visas, and also uses the same address and Suite as me. and close to the same name as my business.

Probably legal unless something is written into your lease forbidding it.