difficulty negotiating price with seller, help

[Stephen Marcil]

so I put an offer in on a house. The wife was on board to counter but her husband is unwilling believing that if they weight until the spring they can get more money. At current asking price, the house is over valued by about 15k when compared to similar homes in that area ,  and in need of  repairs. The house is located in a up and coming neighborhood where a typical listing will last 1-2 weeks before put under contract. This particular house has been on market for >2 months. The immediate plan I have  is to make this house a starter home then a rental. Any advice on how I might be able to motivate the seller to lower their asking price? Thanks.