A lot of stains you can't see and that is what the black light is for to see every area that has been saturated or marked.Not just pets but other stains as well.If you find one area but not all of them then at first the smell will have appeared to go away but will still faintly linger and you will be frustrated trying to find it.Pets have even sprayed furniture before for cushions or solid wood. 

Albany has far more potential right now as far as ROI, I also think the market is less saturated with investors up there (although there are obviously plenty).

Considering the lack of "investment grade" homes in DC, due to rising prices in neighborhoods such a Columbia Heights, Petworth and Capital Hill; and the saturation of money chasing very few deals, many DC investors are beginning to examine the Baltimore market.  

Detroit market is super saturated right now.

Spend a few minutes on here reading and you'll see the student housing market is saturated and the rest of the town it's hard to get good bang for your buck.

Any metro with a population over 1 Million is going to be very saturated with institutional investors and therefore very hard to compete in.

It's true, they are not as easy to come by nowadays since the market is saturated with Investors, but with 1.

The SIZE of the deal and property can also be a factor.For example you can have over saturation levels for instance in a 40k sq ft commercial building for less demand  BUT have strong demand for well located assets 15k sq ft and below.

You can also take this information to fill in any categories that are light (for example, if there are more pending manufactured with days on market higher than the median DOM, that tells you there's some market saturation and to adjust comp accordingly).Last note, I don't do comps based on # of bedrooms. 

They ask how much WILL they make (as if their market cannot get saturated in the future).