He was approached by men he thought were well-to-do Chinese restaurant owners, who viewed the house, asked to move in straight away, and paid the rent promptly in cash.
'Terrible mess'
But on an impulse trip to check the garden, he noticed the door locks had been changed, the curtains were shut tight and there was "a terrible mess".
He returned the next day to look for evidence after he was warned by a police detective friend that the house was probably being used as a cannabis farm.
He became angry when he saw the dirty bathroom, with the bath full of muddy water, fertiliser on the floor, and rags and watering cans, and managed to get in.
"I opened the door - and there standing right in front of me is a young Chinese guy.  A previous landlord from South Wales found his 'to let' home turned into a cannabis factory after a routine visit. On entering the property he found his three bedroomed semi-detached home changed from this...
"I think it was a shock to him more than to me, but definitely a shock to both of us."
Mr Leaver had met the "gardener", the man charged with looking after the cannabis crop, who are often illegal immigrants and at the mercy of the gangs behind the cannabis trade.
Mr Leaver called police and by the time they arrived, the two men had disappeared.
Mr Leaver said: "The police did laugh when I said [what] I had found because I was going to check the garden, because I really found a garden.
 ...to this in a few short weeks
Hydroponic system
"They found 130 cannabis plants valued at around £80,000. They reckon the equipment in there was worth probably between £7,000 and £10,000."
A hydroponic system kept the plants watered, and each room had large pipes installed and going into the loft to keep them ventilated.
There were also 54 heating and lighting units which had been rerouted past the meter box directly into the mains to avoid paying for electricity.
"The power company estimate that their electricity charges would have been upwards of £400 a week," said Mr Leaver.
No-one has been arrested, but Gwent Police said investigations were continuing.
The experience has been costly for Mr Leaver, who had to redecorate the house before installing new tenants, but he said the cannabis farmers "must have lost a great deal of money".
"They lost their crop, they lost all their capital investment and they lost time," he said. "This one, they didn't get away with it."
http://news.bbc.co.uk
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