The Board may consider a new telecommunications tower on a site not previously developed with an existing tower when the applicant demonstrates that shared use of existing tall structures, and existing or approved towers, is impractical, and submits a report as described in Article IX, § 175-70, New telecommunications towers, above; and when the Board determines that shared use of an existing tower site for a new tower is undesirable based upon the applicant's investigation in accordance with Article IX, § 175-71, Shared usage of existing tower site for placement of new towers.