Hello Dave,
Actually, we planned to offer a price. I wanted to set it realistically. That’s why the calculation is in the first post.
Of course, you can offer the seller a price; within a reasonable range, he might accept it. You must never forget: it only takes one interested party for whom the price is reasonable, and he will buy.
What you should always do – especially in your own interest – is ask the seller if there is an appraisal for the property. If not, go through the house with an expert and listen to what he says about the condition and the "realistic" purchase price. If this appointment confirms the seller’s price, you know you’re not buying a pig in a poke – if this appointment reveals major "problem areas," the expert’s costs will be well worth it.
The house has been on the market for a while, not many are looking in that price range.
That rather suggests that the seller is not necessarily dependent on the proceeds from the sale. Therefore – in my subjective assessment – you won’t be able to negotiate much on the price because the seller won’t be interested in your calculations.
Best regards