Answering your edited question:
Either the present perfect or present perfect continuous are fine, but in a more idiomatic usage:
This is to confirm that...
...John Doe has resided/lived at the property since xxx.
...John Doe has been residing/living at the property since XXX.
With since both tenses indicate that the stated action started in the past and continues to the moment of writing.
The difference between the two tenses with since is subtle and not worth worrying about, as they do no affect your purpose.
To wit: the continuous simply stretches out the act of living (or residing) rather than presenting it as a punctiliar event. However, the continuous also is used very often to present a situation that is of limited duration and may soon change.
He's been living here since 2013 but he'll be moving next year.
But again, in your context and purpose, either tense is fine, although I prefer the present perfect (non continuous).