Generally, vacancy rates among quality properties pretty much anywhere in our county is low to very low. Most newer rental buildings (built during the boom and finished roughly since 2005), which offer amenities and offers one or more features such as: pool, balcony, parking, security, views, pet-friendliness, etc, are at or near 100% occupancy.
However, as indicated in several of the responses below, your question is right now too broad to answer. For instance, (rental) price in any area and property type today will be as usual, the biggest factor at getting your property shown. If it meets tenant expectations as to location, size/features and level of care (is it a dump or newly and professionally renovated?), then it is likely to rent to a higher quality tenant that those that do not meet the expectations of the quality of tenant you're looking for.
As it is true with any form of real estate investment, whether single family house, townhouse or condo unit, if you're considering a small building you can buy and control (any type of multi-family configuration such as "residential" duplex, triplex or fourplex or "commercial residential" of 5+units), then your numbers will greatly be influenced by your strategy and financial capabilities.
Buying cash today and having the proper cushion for repairs, updates and/or upgrades is KEY. However, even this is NO guarantee of a successful bid - it typically does guarantees though, a "sit at the (bargaining) table", so to speak.
Equally key is being counseled by the right persons. You should be in close-contact to a trusted attorney as well and with a CPA or qualified accountant to help you with these particulars. Each bring expertise to the table, paramount to your success. In addition, you'll need to find a real estate agent that can counsel you and whose advice and perspective you trust.
It's now your move. There are probably dozens and possibly hundreds of choices for you in almost any price range within the broad areas you mentioned. Narrowing down your search criteria will be of immense use to you for time and frustration-sake. Pick among the cream of the crop with a tighter criteria, then broaden or refocus your search criteria as you evaluate existing options. Find your comfort zone, then stick to a plan.
Finally, when you sit down with your trusted experts, make sure you have (or develop) a clear exit strategy for each and every proposed investment you consider, in case they do not meet your expectations in the end.