Well I look at the faucet and it needs to be replaced , but I tell the tenant that I will be back in 4 hours , clean the place , I cant work with the odor of garbage and a sink that is growing a science experiment .  

Fascinating topic.

They are real REI experts who have maximizing profits and minimizing risks in REI down to a science. 

Credit repair is not rocket science but it is kind of an art.

That said, estimating values is both science and art.

Otherwise you run the risk of the roof deck rotting over the long term, necessitating replacement and, since you sprayed the underside, a re-application of insulation.Joseph Lstiburek and his colleagues over at the Building Sciences Corporation have published several papers and longitudinal studies on applying closed/open cell foam to the underside of roof decks in unventilated attic spaces.  

Fascinating stuff, but, it don't matter if we are really at the top of the Market and ready for a big correction.

I have done this for 3 decades now and landlording simply is not an exact science in these asset class other wise these folks should landlord where they live.. and do it themselves.. 

My Sister-in-law is going to school for Actuary Science.

You need to be careful about picking tenants who won't pick up and vacate at a moment's notice, you need to be a decent landlord to keep this from happening, but you certainly need to have significant reserves in place for when things get tough.Leveraged-to-the-gills operators preening about how perfect their systems are will always try to tell you with a confident grin that they've got vacancy calculations down to a science -- they don't always.