How to upgrade the cabling infrastructure in Head Quarter building, (horizontal and backbone) at a from 10 - base -T (twisted pair) LAN cables (shared media - with hubs, not switches and 100Mbps with core switches in the backbone ) to a more modern structure.

Could you draft me a memo that lays out the two or three cabling options she is likely to raise and give me your best recommendation? What is state of the art? Where is this likely to head the next couple of years?

*note:

HQ is a 6 story building of which TRU currently occupies the top 4 floors (about 50 people per floor, with total space per floor of about 7500 sqft [100x 75] and a small data center on the first floor). We own the building so there is room to expand if necessary. The current horizontal cabling (10mbps, star wired using hubs) was in place when we bought the building several years ago. The networking equipment in the TCs is 6 years old (end of life). Current backbone cabling is 100 mbps capable and uses L3 switches at the core. Most people work in "open office" cubicles but there are offices or conference rooms in the four corners of the building.