Plans have been submitted to redevelop Hertfordshire Constabulary's headquarters in Welwyn Garden City.
The county's Police and Crime Commissioner says the police force's current buildings "have reached the end of their economic life".
The proposals submitted to Welwyn Hatfield Council would see two new modern buildings created on-site.
Several modern buildings would be retained but three of the large administration blocks and five smaller buildings - some dating back to the 1960s - would be demolished if plans are approved.
Planning documents state the current headquarters in Stanborough Road requires "serious repair" and maintenance costs are increasing every year.
The site is Hertfordshire Constabulary's main headquarters, providing key facilities to help officers across the county. It is also home to the emergency call centre.
One of the biggest reasons for the redevelopment, which is believed to cost in the region of £50 million, is to maintain staff health and wellbeing. More than 600 staff are expected to work across the site.
The plans state the "deteriorating buildings, thermally inefficient construction and uninspiring workplace" could be a "problem" in "attracting" new police talent, as well as maintaining existing employees.
Hertfordshire Constabulary Chief Constable Charlie Hall said: "These proposals will provide my staff and officers with much improved working conditions and facilities that will be fit for purpose and improve our efficiency for many years to come.
"The redevelopment will also allow us to work more effectively with partners to ensure Hertfordshire remains a safe and pleasant place to live and work."
If the Constabulary's plans, which have been in the pipeline since 2017, are approved, the headquarters would also provide a new base for Hertfordshire Fire & Rescue.
The county's police and crime commissioner David Lloyd said: "The current HQ buildings have reached the end of their economic life and are expensive and inefficient to run. The new facilities are designed to remain fit for purpose for the next sixty years."
The development will be funded through long-term borrowing, a spokesperson for Mr Lloyd's office said.
A public consultation was held by Hertfordshire Constabulary earlier this year to gather views from residents and now a full application has been submitted.
The plans can be found on Welwyn Hatfield Council's planning portal. The reference is 6/2021/2125/MAJ.
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