Question: Article: The county council aims to build 31,400 homes and create thousands of jobs over the next 20 years in a bid to attract more businesses and people to the area.
But inspector Harold Stephens said the plan was "unsound" and assumptions about job growth were "very ambitious".
A Durham County Council spokesman said the report was "beyond disappointing".
The County Durham Plan hopes to create 30,000 jobs by 2030 as well as building the homes and creating 500 hectares of space for businesses, warehouses and offices.
In the report, the independent inspector Mr Stephens said: "The objective assessment of housing needs is too high because the council's vision for a successful local economy incorporates unrealistic assumptions about jobs growth and associated in-migration.
"The reliance on high employment growth and associated high levels of in-migration that is built into the preferred economic scenario represents an unacceptable risk which I cannot support on the basis of the evidence before me."
The report was carried out following a public inquiry last year.
Councillor Neil Foster said the council "remained confident" that the proposals were "robust".
"To learn at this stage of the inspector's reservations and recommendations is beyond disappointing," he said. "We have been clear for many years that to turn around the county's economic prosperity an ambitious and forward-thinking partnership approach is required.
"We have only just been given the report but we are extremely concerned that by not having this carefully thought through and managed approach our communities will be left vulnerable to speculative and unplanned development."
Mr Stephens concluded it was not in the "best interests" of planning or plan-making to recommend an "unsound plan" for adoption.
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Summarize: Plans for a multimillion-pound development for County Durham have been branded "unrealistic and flawed" in a report by a senior inspector.


Article: Media playback is not supported on this device
Olympic, world and European champion Dujardin beat Hester, 48, into second in Tuesday's dressage grand prix.
Hester, who won Olympic team dressage gold with Dujardin, 30, and Laura Tomlinson in 2012, claimed victory on Nip Tuck at Olympia on Wednesday.
Dutchman Hans Peter Minderhoud was third on Glock's Flirt.
Briton Lara Griffith finished fourth on Rubin Al Asad.
Five days of showjumping begins on Thursday, with Britain's world number one Scott Brash in action.
Media playback is not supported on this device
Thursday 17 December
Live coverage of the Olympia Puissance high-jump competition
Red Button, online & connected TV from 21:00 to 22:15 GMT
Sunday 20 December
Live coverage of the latest World Cup leg, plus highlights of the puissance high-jump competition
BBC Two, online & connected TV from 13:45 to 16:30 GMT
Monday 21 December
Live coverage including the Olympia Grand Prix
Red Button, online & connected TV from 18:45 to 22:25 GMT
Wednesday 23 December
Highlights of the week, including the Olympia Grand Prix
BBC Two HD, online & connected TV from 11:00 to 12:00 GMT
All programmes times subject to change
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Summarize: Britain's Carl Hester won the freestyle dressage title at the London International Horse Show, with Charlotte Dujardin finishing second.


Article: The 20-year-old links up with Paul Cox's League Two side ahead of their game at Portsmouth on Saturday.
With a number of players ruled out of the trip to Fratton Park, Cox has been given permission by Stags chairman John Radford to bring in Sendles-White.
"We've had to move into the market as a result of our injury situation," Cox told the club website.
"We've brought in a player, in Jamie, who has international experience with Northern Ireland at youth and Under-21 level. He also featured in QPR's pre-season tour of Germany and is a player they rate very highly."
Centre-back Sendles-White is yet to make a senior appearance at club level.
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Summarize: Mansfield Town have signed young defender Jamie Sendles-White on a month's loan from Queens Park Rangers.


Article: Mark Keary said pupils cannot access Twitter or Facebook on Bethnal Green Academy computers.
"Police have advised us there is no evidence radicalisation took place at the academy," he said.
Shamima Begum, Amira Abase, both 15, and Kadiza Sultana, 16, flew from London to Turkey on Tuesday.
UK police officers have gone to Turkey but their role has not been confirmed.
The girls were all studying for their GCSEs at the east London school, which reopened on Monday after half term.
The head teacher said the school was "shocked and saddened" by the girls' disappearance.
"This situation follows the earlier disappearance of a student in December of last year," he said.
"The police spoke to the student's friends at that time and, further to this, they indicated there was no evidence the girls were at risk of being radicalised or absconding."
Mr Keary said it was business as usual for the 1,200 pupils and staff, although "a full programme of briefing sessions" with police and counter-radicalisation groups was available.
"The priority for all of us is the safe return of the girls," he added.
The girls boarded a Turkish Airlines flight from Gatwick, and would have needed a visa for Turkey and a passport.
It has emerged that Shamima used the passport of her 17-year-old sister Aklima to travel.
Security services have been criticised after it emerged that, before leaving the UK, Shamima sent a Twitter message to Aqsa Mahmood, who left Glasgow for Syria in 2013 to marry an Islamic State fighter.
According to a lawyer for Ms Mahmood's family, her Twitter account has been "monitored" by police since she left Britain.
He said authorities should have seen Shamima's message and taken action before she and her two friends followed.
Their families have made appeals for them to come home.
Another of Shamima's sisters, Renu Begum, said she hoped her sister had gone to Syria to bring back the girl who had gone there from Bethnal Green Academy in December.
Ms Begum said Shamima and her friends were "young" and "vulnerable" and if anyone had tried to persuade them to go to Syria it was a "cruel and evil" thing to do.
Amira's father, Abase Hussen, said: "The message we have for Amira is to get back home.
"We miss you. We cannot stop crying. Please think twice. Don't go to Syria."
In an appeal to Kadiza, her sister, Halima Khanom, said: "Find the courage in your heart to contact us and let us know that you are safe and you are OK.
"That is all we ask of you."
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Summarize:
Answer: There is no evidence that three girls, thought to be heading to Syria to join Islamic State, were radicalised at school, their principal has said.