Most listings are in the $10's per square foot per year. The Myrtle Beach submarket is experiencing a decline in rates. In the last 3 months, the median rate decreased $19 per sqft per year. That's a 54% decline in rent.
In the last 90 days, 5 listings have come on the market, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,750 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1996 and are Class A.