With regard to unused or underused federally-owned buildings which can be converted to housing, as of June 15th 2025: (a) how many units of housing can be produced with (i) minimal interior renovation, (ii) extensive interior renovation (i.e. gutting), (iii) extensive interior and exterior renovation; and (b) what is the estimated cost per unit in (a)(i), (a)(ii) and (a)(iii)?