The National Police have launched an investigation after Ian Thompson, a British national, 64, was reported missing on Saturday.
Thompson, who has lived in Estepona since last October, was last seen by his daughters. "He was in bed at 1.30am [on Thursday night] and he woke up early the next day to go to work. On Saturday morning, when we saw he hadn't come back, we called the police," said his girlfriend, Claudia, who last saw him on Thursday when he dropped her at work before heading to the Social Security office in Marbella.
Thompson, who is a property developer, would routinely join colleagues for a drink on Friday nights after work which is why the alarm wasn't raised until the following day.
"All of his clothes are still here. He was only carrying his wallet, with his documentation, and his mobile phone. This has never happened before," she said.
Concerned family members tried to call him and sent him numerous messages until his phone stopped giving signal three days after he disappeared.
"This is a nightmare. We haven't been able to sleep since Saturday and we've not heard any news," said his partner. "We know a few people here and they are helping us to try and track him down."
Thompson's family in the UK, including his son, have also joined the effort by spreading pictures of him across social media.
According to information provided to SOS Desaparecidos, Thompson had taken his car, a green Renault Laguna, and was wearing a black jacket with white lettering and jeans at the time of his disappearance. He has grey hair, wears glasses and is around 1.75 metres tall. He has a good level of Spanish.
Any information regarding his possible whereabouts should be directed to Estepona police.