Most listings are in the $10's per square foot per year. The Clark County region is going through a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 14% decrease in rent.
In the last 90 days, 12 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 117% of the listings in the Clark County are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,150 sqft. Most properties in this region are around 1 floors. Most buildings in this area were built in 1965 and are Class B.