@Giovanni Isaksen has an excellent Deal Analyzer you should check out.  

Standing still because you are stressed out about windows or you are trying to think of yet another way to analyze the deal moves you in the wrong direction.  

Don't spend too much time analyzing it beforehand.  

You can use the PB property analyzer, it is pretty good.  

Check out this article written about Real Estate Comps and scroll down to "Free House Value Sites & Paid Property Value Sites" I would also check out this article on Intro to Real Estate Deal Analysis to give you a really good idea and starting point on analyzing the numbers.

I'm sure you ran the numbers already on your new income property, however be sure to check out the "analyze" tab as it has some tools that could be useful to you on your next deal.  

Plus, you worked for this deal don't let anyone tell you you are making too much for being able to market, meet, analyze and negotiate a deal they are jealous of.

Trouble is, I'm working with only a little info, so you need more info to analyze, and every area is different.What you need to do is list all the properties that sold within the last 60 days, within 10% of the sq ftg of the subject property, and see what the high, low, avg sales prices were, and the high/low/avg per sq ft price was and then the number of days for those groups.Then see if you can spot a trend.JV

However, if the seller will not budge I will explain what I can do at that price, and then analyze if it is worth taking the listing at the overpriced number.

HI Todd,It depends on your cash on cash return or other metric by which you analyze property and your criteria.If you're making 300 per month estimated thats 3600 a year divided by estimated available equity of 20,000 (155k - 135k) which would be a 18% cash on cash return.Realistically its not 20k because of transaction costs so another way you could look at is to deduct the "what if I sold it," transaction costs out of your available 20k equity.