I am thinking it may be worthwhile to look into developing the property to increase it's value substantially prior to sale.

It's not the same pressure of having to work for money, and that's a worthwhile place to be. 

Who knows though, I love what I do, so I could work longer just because I find it interesting and worthwhile.  

I have read every book mentioned in this thread, and they were all worthwhile.

No matter how much you try to explain it to people, some would rather just shut their brain off and not challenge every decision they've made, rather than admit that what you're doing or trying to do might be worth while.

I personally believe that being part of a community, knowing my neighbors, and creating a bedrock for others to anchor upon is a worthwhile endeavor.

Thinking it was sleazy, illegal, and not worthwhile. 

Acquiring wealth is not easy, nothing worthwhile is.It's also important to know that you don't necessarily need a huge pile of cash to start investing. 

@Thalia Georgopoulos  no, that won't exempt you from rent caps.However, as stated in the bill, you can remove tenants for no-fault just causes(2) No-fault just cause, which includes any of the following:    (A) (i) Intent to occupy the residential real property by the owner or their spouse, domestic partner, children, grandchildren, parents, or grandparents.As long as your property is considered residential real property, the bill says you can move in and get rid of the tenant as a no-fault just cause.However, according to section (d)(1), you will be responsible for their moving expenses, equivalent to one month's rent.If you are way way below market, this could be a worthwhile solution.There are so many loopholes with this bill, unsurprisingly.

@Matt Higgins I'm guessing that along with the rent increase from $400 to $800 you probably invested in some needed repairs/updates in the property,  and its a lot more likely that your operating budget now covers all expenses, allows for ongoing basic maintenance, and makes enough return to be worthwhile to you.