John Russell Brown and his company Hyperion Investments face 16 charges relating to the condition of the property and the danger and risk to health of the occupants in it.
The migrants were found during a raid on Deeside Lane, Sealand - one of the largest of its kind in the country.
Magistrates in Wrexham adjourned the case until 10 December.

The California company, which is due to release a new phone later this year, said it sold 50.8 million iPhones in the period, down 1% year-on-year.
Apple reported a 4.6% rise in revenue across the whole company, slightly below analysts' expectations.
Shares in the firm fell nearly 2% in after-hours trading after earlier hitting a record high.
Apple said quarterly profits were $11bn (Â£8.5bn), up 4.9% from the same period in 2016.
Despite falling unit sales, revenue from the iPhone still climbed 1% to $33.2bn as it sold more of the bigger, more expensive iPhone 7 Plus.
This is always the least impressive time of year for Apple's earnings, come as it does after the Christmas period. But worse-than-expected iPhone sales had investors slightly unhappy after anticipation of strong earnings sent shares to record highs earlier on Tuesday.
That said, revenues are up, in part because of "robust" sales of the iPhone 7 Plus, the bigger, pricier model.
Tim Cook told investors he was also pleased with the continued growth of its Services division - that's things like Apple Music, Apple TV, iTunes and so on - but the health of Apple is only realistically measured with the success of that all-conquering smartphone.
Which is why the rest of the year will be exciting to watch.
With the iPhone's 10th anniversary upon us, expectations are high for the next device.
Anything short of a major improvement would be troubling for investors who are banking on the next iPhone being a blockbuster, not an incremental upgrade.

A mouse was seen running around the cabin floor of the Chicago-bound flight.
Staff tried to trap the tiny rodent but they couldn't find him.
It's not the first time a tiny stowaway has caused problems; two flights from New York to London were cancelled in 2009 after mouse sightings.
Officials had to ground the plane in Sweden and had to find alternative flights for all 250 passengers.
The airline's boss said that the mouse could be a safety risk if he tried to nibble through the aircraft's wires.

He lost control of his microlight while attempting to land at an airstrip near Edenbridge, Kent, on 16 July last year.
Investigators said his decision to fly at 15:30 BST was when conditions were more likely to be turbulent than later.
They said he may have been influenced by the fact the airstrip operator took time to help him prepare the aircraft.
"He may have felt some pressure to fly," the Air Accidents Investigation Branch (AAIB) report found.
A nearby dog walker described how the Pegasus Quantum 15 was "a bit wobbly" and travelling "too fast and at too acute an angle" as it came in to land at East Haxted Farm Airstrip.
The AAIB said the pilot encountered "very rough air" which caused him to veer off course and abort the landing.
The pilot, who was not identified by the AAIB, suffered chest and hand injuries when the microlight became entangled in the branches of an oak tree about 15ft (4.6m) above a field near Lingfield Road.
He was freed after several hours by fire crews using using ladders, lines and a winch.
He had held a private pilot's licence since 1997 and although he was "reasonably experienced" he was "not in current flying practice" and had flown for just two hours in the 90 days leading up to the crash, the report said.
Civil Aviation Authority data from December 2015 shows  he was one of the country's oldest pilots, as just 13 people aged 89 or older held pilot licences at that time.
Holders of his type of licence aged over 50 must renew a medical certificate every 12 months to keep flying.
A man has appeared in court after 107 migrants were found crowded into a building in Flintshire.
[NEXT_CONCEPT]
Apple sold fewer iPhones than a year ago in the first three months of 2017, the company said in its latest results.
[NEXT_CONCEPT]
When passengers started boarding a flight from Stockholm in Sweden they spotted an unusual passenger scurrying between the seats.
[NEXT_CONCEPT]
A 90-year-old pilot who was seriously hurt when his microlight crashed in to a tree may have felt under pressure to fly, according to an accident report.