§ 54. Exemption of property from state taxation. The said property
shall be and continue forever thereafter exonerated and discharged from
all taxes, assessments and other charges, which may be levied or imposed
under the authority of this state; but the jurisdiction hereby ceded and
the exemption from taxation hereby granted, shall continue in respect to
said property so long as the same shall remain the property of the
United States, and be used for the purposes aforesaid, and no longer.