expansion at the Gaydon plant includes a new chassis and pilot build facility, as well as an extension of the parts and logistics storage area, and new offices. In total, Aston Martin will add approximately to the plant. In 2014, Aston Martin suffered a pre-tax loss of £72 million, almost triple of the amount of 2013 selling 3,500 cars during the year, well below the 7,300 cars sold in 2007 and 4,200 sold in 2013 respectively. In March 2014, Aston Martin issued "payment in kind" notes of US$165 million, at 10.25% interest, in addition to the £304 million of senior secured notes at 9.25% issued in 2011. Aston Martin also had to secure an additional investment of £200 million from its shareholders to fund development of new models. It was reported that Aston Martin's pre-tax losses for 2016 increased by 27% to £162.8 million, the sixth year it continued to suffer a loss. In 2016, the company selected a 36-hectare (90-acre) site in St Athan, South Wales for its new factory. The Welsh facility was unanimously chosen by Aston's board despite fierce competition from other locations as far afield as the Americas, Eastern Europe, the Middle East, Europe, as well as two other sites in the UK, believed to be Bridgend and Birmingham. The facility featured three existing ‘super-hangars’ of MOD St Athan. Construction work of converting the hangars commenced in April 2017. Aston Martin returned to profit in 2017 after selling over 5,000 cars. The company made a pre-tax profit of £87 million compared with a £163 million loss in 2016. 2017 also marked the return of production of the Newport Pagnell facility ten years after it originally ceased. 2013–present: Partnership with Mercedes-Benz Group In December 2013, Aston Martin signed a deal with Mercedes-Benz Group (at the time known as Daimler) to supply the next generation of Aston Martin cars with Mercedes-AMG engines. Mercedes-AMG also was to supply Aston Martin with electrical systems. This technical partnership was intended to support Aston Martin's launch of a new generation of models that would incorporate new technology and engines. In exchange, Mercedes will get as much as 5% equity in Aston Martin and a non-voting seat on its board. The first model to sport the Mercedes-Benz technology was the DB11, announced at the 86th Geneva Motor Show in March 2016. It featured Mercedes-Benz electronics for the entertainment, navigation and other systems. It