I can't guess why you would want to do this, so my suggestion by not fit your need. I would consider adding a Table with only 1 column and 250 rows which can very quickly be sized as you wish. Place it adjacent to column of 1000 rows table. Select the new table by clicking on the table name in the Sheets pane to reveal the corner and side open-box handles. Position the new table to align the top border, then grab the bottom handle and stretch the table until it bottom-aligns with your longer table.
It would also be possible to use the Table Inspector to set the row height exactly, to something like 2".
In the end you will have:
Jerry