Excel: How to use an Array to concatenate strings that are next to a criteread section (If function)

Question

Good Day Everyone

I have an Excel sheet as bellow in two columns. I know how to use an array if function with sum to add up all values next to a column that has met

Answer 1

Was really Strugling to get it right and eventualy got an answer from a stackoverflow question on how to concatenate whole columns.

Sorted the data via B and then used =TRANSPOSE(A4:A6)

Then Used F9 on the function to get this line ={"Mansion1","Mansion 2","House 3"}

Copied and Concatenate and just remove the {

But this was not ideal as the data set I want to use this on is 2500+ lines :( Manualy did it though :( :( but will try the above answers for future use.