The typical asking rate per listing is in the $10's per square foot per year. The Pasadena submarket is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 8% decline in rent.
Compared to the rest of the Houston Metro market, the Pasadena submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 26 listings have been listed, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 4% of the available leases in the Pasadena are subleases, so you will probably have to consider a longer term lease. 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 1,030 sqft. Most properties in this market are close to 2 stories. Most buildings in this area were built in 1988 and are Class B.