follow up
follow up
so...using 250.54 from 2008 NEC
1 or more Auxillary ground electrodes SHALL BE PERMITTED to be connected to equipment grounding conductors specified in 250.118 and SHALL NOT BE REQUIRED to comply with bonding requirements of 250.50 or 250.53(C) or resistance requirements of 250.56 but the Earth SHALL NOT be used as an effective ground-fault current path as specified in 250.4 (A)(5) and 250.4 (B)(4).
Nothing prohibits you from using building steel to connect to. Attachment requirements would be covered under 250.8.