How to slice a string in a nested element inside of an array with Javascript?

I need to slice a string element that is nested inside of a JSON file formatted as an array using JS.

"fields": {
            "title": "Jameson Library 12th Floor",
            "slug": "Jameson-12th-floor",
            "shortDescription": "[All Jameson Library Floors](/jameson-floor-maps \"All Jameson Library Floors\")",
            "building": {

The filteredFloors array is passed into the component as data and mapped to a table.

{data.map(item => (
          <tr key={item.sys.id}>
            {columns.map(column =>
              <td role='cell' key={this.createKey(item, column)}>{this.renderCell(item, column)}</td>)

I'm trying to return an array that omits the first 17 spaces of the title so all that remains is the floor (i.e. "12th Floor"). Any ideas?