More than 200 jobs are set to be created with the opening of a new office complex.
The Lacuna Place office and retail development has recently been completed in Hastings' Priory Quarter business district and firms have already expressed an interest in moving in.
The scheme is part of the wider regeneration of Hastings town centre, which is expected to create thousands of much-needed jobs.
Keith Sadler, deputy director at Sea Space, said: "Hastings town centre is changing dramatically and the completion of Lacuna Place is a watershed.
"It gives the town much-needed large, high quality business premises.
It will help local firms expand and attract companies from outside the area, so creating jobs.
"With the University Centre and Creative Media Centre thriving, a new college being built, a contemporary art gallery just opened, many more offices and shops and a public square soon to come, Priory Quarter is rapidly emerging as one of the most dynamic commercial districts along the south coast."
One floor of office space and one retail unit are already under offer with a high level of interest being shown in the remaining spaces.
Sea Space said companies which had expressed interest included professional services such as law firms and accountants.
Lacuna Place stands in Havelock Road, opposite University Centre Hastings, and has more than 30,000 sq ft of offices over five floors.
It also incorporates two retail units on the ground floor.
Lacuna Place has been created as part of a ten-year investment programme for the area by Coastal Land (Sussex) LLP, a joint venture between development agency Sea Space and property specialist The Land Group.
Allied Irish Bank has invested 12million in the development and related schemes.
The building was designed by architects Proctor and Matthews to fit with the historic streetscape.
Letting of the office and retail spaces is being handled by an agents team comprising of DTZ, Cluttons and Dyer Commercial.
Construction of Priory Square and One Priory Square, a larger 46,000 sq ft office development, is already underway and is scheduled to be completed by early next year.
Companies interested in Lacuna Place or the wider Priory Quarter scheme should contact Richard Harding at DTZ on 0207 408 1161.