I don't understand your question.
The three completely different words
"there,"
"their," and
"they're" are pronounced IDENTICALLY.
"There" is always pronounced the same way.
In these two sentences, "there" is pronounced the same way.
"There is a skyscraper in New York named the 'Empire State Building.'"
"There are many skyscrapers in New York."
Very very very rarely you may see the contraction "there're" (for "there are.") It is colloquial, it is not in dictionaries. It is used in quoted dialog to show the exact way someone is speaking. Do not try to use yourself. It is pronounced "therur" but with an indefinite "schwa" sound where I've written "u." It is simply what happens naturally when someone say "there are" quickly and with sloppy diction.
"There's a skyscraper in New York named the 'Empire State Building.'" <--good English, "there's" is a valid word.
"There're a helluva lotta big ol' skyscrapers in N'york." <---NONSTANDARD English.