I started in 2009 unemployed with a massive recession preventing anyone hiring me back into the 9-5 world for 18 months. 

I agree with the above posts that this design work is a ton of often undervalued work for them and has a massive impact on the accuracy of your quote/estimate.

I know that's a massive pool of people to generalize, but it seemed like a few people were agreeing.

If you don’t mind me asking what is a good brand of water heater that will not take up a massive amount of space and not undersupply the house with hot water?

I understand that wholesaling is a massive marketing undertaking.

They could be small (the rehab work wasn’t as good as you’d like) or massive (contractors takes your money, does no work and you’re screwed).

On the other hand, I've made several massive assumptions, any one of which, if corrected, could dramatically change the outcome. 

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I sold my sister a duplex in San Pedro a few years ago and she has had massive appreciation, and we have seen the area improving. 

Basic: don't forget the advice from Warren Buffet, know what you are buying and also why you are buying it.