Overall incorporating a beach theme to attract vacationers.

The East Side, Bayview, Riverwest, Washington Heights, Walker's Point, etc tend to be the more well known B-class areas that can have attractive options.

I currently own two one beds, located in Carroll Gardens and Park Slope, I also own a 3 bed in South Slope that I live in.In regards to the four neighborhoods you mentioned and how they will potentially appreciate, I would say the following:PLG- I wouldn't buy a one bed unit here, as it primarily attracts families looking for relatively affordable singe family town houses, and doesn't offer much that young professionals would be attracted to.Prospect Heights- A great area full of dinning options, transportation, bars, etc. 

Raising Capital for Real Estate: How to Attract Investors, Establish Credibility and Fund Deals - Hunter Thompson6.

I bought some property with 2 houses and an apartment. At the time one house added 0 value to the mortgage, I went to refinance the property and I was told I could not refinance due to the second home having 0 value. ...

Many of our clients invest into alternative assets both inside and outside of their retirement accounts.

That should attract competitive offers, including cash offers. 

Open to other alternatives as well! 

✓Second Home Requirements must be occupied by the borrower for some portion of the year is restricted to one-unit dwellings must be suitable for year-round occupancy the borrower must have exclusive control over the property must not be rental property or a timeshare arrangement1 cannot be subject to any agreements that give a management firm control over the occupancy of the property must be underwritten in DU and receive an Approve/Eligible recommendation, with the exception of high LTV refinance loans required to be underwritten in accordance with the Alternative Qualification Path (see B5-7-03, High LTV Refinance Alternative Qualification Path).

Because these are personal and not commercial investment property mortgages, the structures are very attractive - 30 yr fixed rates that are around 3.5%, 20% down originally, with no prepay penalties, reserve requirements, etc.