There are so many options for space if you’re starting a company in St Petersburg Florida.
Virtual Offices, Co-working spaces, and Private Offices (known as Executive Suites) all all available in a variety of locations.

Private offices usually include access to meeting rooms, a shared receptionist, business phone line, all utilities including internet, mailing services, copier/printing, and often a kitchen/breakroom.

High-rise Office Space

Do you want to have an office in a shiny glass high-rise? in the BB&T building at 300 Central Ave the Regus group manages a space that offers offices, co-working space, virtual offices, meeting rooms, and a business lounge.

Private offices start at $640/mo
Co-working space starting at $300/month

From their website:
You’ll have access to convenient amenities like the state-of-the-art fitness center, a full service bank and car detailing services on site.
https://www.regus.com/locations/united-states/florida/st-petersburg/florida-st-petersburg-first-central-tower?utm_source=Google_Places&utm_medium=Places&utm_campaign=Places

Station House

If you’d like to be downtown but want a space that’s more eclectic there’s Station House. The co-work space houses a mixture of businesses and the events and amenities are designed to create a community where you can mix with other entrepreneurs.

Private offices start at $500/mo
Conference rooms available to non-members

http://stationhousestpete.com/co-working-space/

North St Pete

If you’d like an office with fewer parking issues, and easier access to North Pinellas County and across the bridges you might consider an office at
9800 4th Street North.

Private offices start at $600/mo
http://www.executivecentersuites.com/executive-suites-in-tampa-bay/