Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of tallest structures in Tokyo
Table title:
Timeline of tallest buildings
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Years as tallest </th><th colspan=1 rowspan=1 > Height m (ft) </th><th colspan=1 rowspan=1 > Floors </th><th colspan=1 rowspan=1 > Ward </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <th colspan=1 rowspan=1 > Ryōunkaku </th><td colspan=1 rowspan=1 > 1890–1923 </td><td colspan=1 rowspan=1 > 69 (225) </td><td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > Taitō </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Old Marunouchi Building </th><td colspan=1 rowspan=1 > 1923–1936 </td><td colspan=1 rowspan=1 > 33 (109) </td><td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > Chiyoda </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > National Diet Building </th><td colspan=1 rowspan=1 > 1936–1964 </td><td colspan=1 rowspan=1 > 65 (215) </td><td colspan=1 rowspan=1 > 9 </td><td colspan=1 rowspan=1 > Chiyoda </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Hotel New Otani Tokyo </th><td colspan=1 rowspan=1 > 1964–1968 </td><td colspan=1 rowspan=1 > 72 (237) </td><td colspan=1 rowspan=1 > 17 </td><td colspan=1 rowspan=1 > Chiyoda </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Kasumigaseki Building </th><td colspan=1 rowspan=1 > 1968–1970 </td><td colspan=1 rowspan=1 > 156 (512) </td><td colspan=1 rowspan=1 > 36 </td><td colspan=1 rowspan=1 > Chiyoda </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > World Trade Center Building </th><td colspan=1 rowspan=1 > 1970–1971 </td><td colspan=1 rowspan=1 > 163 (533) </td><td colspan=1 rowspan=1 > 40 </td><td colspan=1 rowspan=1 > Minato </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Keio Plaza Hotel North Tower </th><td class="highlighted"  colspan=1 rowspan=1 > 1971–1974 </td><td colspan=1 rowspan=1 > 180 (589) </td><td colspan=1 rowspan=1 > 47 </td><td colspan=1 rowspan=1 > Shinjuku </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Shinjuku Sumitomo Building </th><td colspan=1 rowspan=1 > 1974–1974 </td><td colspan=1 rowspan=1 > 210 (690) </td><td colspan=1 rowspan=1 > 52 </td><td colspan=1 rowspan=1 > Shinjuku </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Shinjuku Mitsui Building </th><td colspan=1 rowspan=1 > 1974–1978 </td><td colspan=1 rowspan=1 > 225 (738) </td><td colspan=1 rowspan=1 > 55 </td><td colspan=1 rowspan=1 > Shinjuku </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Sunshine 60 </th><td colspan=1 rowspan=1 > 1978–1991 </td><td colspan=1 rowspan=1 > 240 (787) </td><td colspan=1 rowspan=1 > 60 </td><td colspan=1 rowspan=1 > Toshima </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Tokyo Metropolitan Government Building No. 1 </th><td colspan=1 rowspan=1 > 1991–2007 </td><td colspan=1 rowspan=1 > 243 (799) </td><td colspan=1 rowspan=1 > 48 </td><td colspan=1 rowspan=1 > Shinjuku </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Midtown Tower </th><td colspan=1 rowspan=1 > 2007–2014 </td><td colspan=1 rowspan=1 > 248 (813) </td><td colspan=1 rowspan=1 > 54 </td><td colspan=1 rowspan=1 > Minato </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Toranomon Hills </th><td colspan=1 rowspan=1 > 2014–present </td><td colspan=1 rowspan=1 > 256 (838) </td><td colspan=1 rowspan=1 > 52 </td><td colspan=1 rowspan=1 > Minato </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
What is the change of the tallest building in 1974?
Answer:
The Keio Plaza Hotel tower was the tallest building until 1974, when it was surpassed by the Shinjuku Sumitomo Building.