The typical asking rate per listing is in the $10's per square foot per year. The Clark County submarket is experiencing a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 14% decline in rent.
In the last 90 days, 12 listings have come on the market, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the available space 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 1,000 sqft. Most buildings in this market are approximately 1 floors. Most buildings in this market were built in 1955 and are Class B.