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How do I say these,

1. When I want to introduce myself, I should say, "I am XXX" or "This is XXX"?

2. Is it correc to say, "I'm your tenant at (name of the apartment)" --> the preposition "at" used correctly here? or this is not the rigth sentence structure to express the meaning? Pls advise.

Thank you!
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1. We usually say 'My name is', but 'I am' is OK.
2.I'm your tenant at/in (name of the apartment).
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Thank you!