The quotes I got were quite a bit higher than the numbers you mentioned (I was getting quotes of 150k on the low end, all the way up to 235k on the high end to design, permit, and build it)...I don't know whether the quotes I got were more realistic, or if your numbers are more realistic, or if the reality would be some middle ground...but, point being: if you go the ADU route, just double- and triple-check that your quotes are realistic.Also, what are the prospects for raising rent at the duplex? 

Ok I’m still learning but if your funding that much I’m guessing your looking for good roi while your on the beach so I would look into triple net properties, that have long term business.

I tripled my rates when she came thru town. 

Sorry for the triple post as this is also my first three posts....

In 2005 people were seeing that in two months out here.I would say anyone that builds a custom home out here now would see gains of double or triple in 9-10 years.

In Maryland you can be hit up for triple damages for not following security deposit laws.

If you have a 5% mortgage and you can put 20% down on another cash-flow property that makes 15% COC then you are tripling your return doing that rather than paying down your mortgage.

He could double or triple his monthly income if he concentrated on cash flow as opposed to accumulating equity.

Started in 2011.2012: Profits were roughly $40k to split by two owners, after reinvesting to triple the amount of product we keep in stock2013: Profits were roughly $120 to split, but again had to reinvest in order to double product on hand.2014: Accrued 190k in debt early 2013, paid back in full this month, and no need to grow product in stock even more.

I already double and tripled my money.