The typical asking rate per listing is in the $10's per square foot per year. The Pasadena submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 4% rise 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, 36 listings have come on the market, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 3% of the listings 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,440 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1988 and are Class B.