I'll give it a shot!

That may be heresy in today's market but I still stick by it.Trying to think of other ideas, I'm not sure if this is an on-market property or not, but especially if it's not, there could be the possibility of paying the seller for an option to buy the property at a certain price within the next year, and letting the seller continue owning it through the winter, then you exercise your option and purchase it in the spring once the ground has thawed out.That's a much easier concept to pitch to the owner if they don't have a real estate agent who's basically just motivated to sell it and get their commission ASAP, but if they've had a few deals fall through because of the failed septic then even if there's an agent, maybe they'd be open to it.Alternatively, and maybe simpler than an option, would be just putting down a decent-sized earnest money deposit and having a closing date in the spring - basically an unusually long period for the closing.

It sounds like you're going to be paying out decent money, and will want to claim this on your taxes, so do it right. 

There should be decent cash flow and appreciation and it being directly next to my other property makes it much easier to manage.My question is: How, if possible, can I predict what kind of added value there is in having a double lot? 

The rates are pretty decent if your going for a flip or finding and investment property.

The property is in decent shape but it is a somewhat older property.

It turns out there were some things that our inspector missed, and we were very happy to have the extra funds available to address them.My suggestion would be to make sure you have enough for the down payment plus a decent operating budget/emergency fund....maybe 6 month worth of projected expenses at least.Hope that helps.Mike

Worth a shot! 

CGS Tech has a decent survey on YouTube.

2) should iget a decent looking house with light/medium cosmetic work thats needed?