The equipment is all pretty much the same.

On the closing day, in a class act, he completely emptied the office of all furniture, computers, equipment, records, leases, etc.

Many people are prepared and equipped to sell a house themselves, it does not sound like you are at this stage.

This experience gives new firefighters the opportunity to learn the specifics of the job, run calls, interact with the crews, see the equipment, etc.

They tried to tell me their equipment was in a home I sold (it wasn't), and they needed the info to come and get it.

How long in business, do they have a crew, how many projects have they worked on in the last 12 months, do they have their own equipment, do they work with sub-contractors, are they licensed, need to know that they have insurance, workmens comp, etc.Investors are looking for the bottom line and best prices, of course, so there is money in the deal. 

The necessary equipment should cost around $2,000 to $2,500 (including a fast tablet: iPad Air 2) at a minimum.

If you're are talking about the business itself, there are a few ways to value it.The value of the assets - You would value the FF&E (Furniture, Fixtures, and Equipment), along with any intangible assets ( goodwill) to come up with a total value.

But I was wondering if I can get him down to say $9,000, use the resources available to me as part owner of this business to demolish the house and make the lot ready to build, do you think I could find  someone  who would invest to purchase it with me and my company providing equipment and labor to do the work and then split the profits and do you think it could be sold for enough to turn a profit? 

To provide some basic information to better equip you for this conversation;Some of the most common forms of legal entities include; limited partnership, general partnership, LLC, corporation, and trusts.