Arnon,
I don't have a source for spreadsheets or the like for multifamily. Most of the spreadsheets/models that I've seen were prepared by my colleagues or investment brokers (only property level), but I haven't seen any for multifamily. I assume that it would be the same some of the assumptions would be different.
I forgot to mention, make sure that you check out Argus. It is the industry standard (espicially in the US) software for valuation (at the property level). Don't buy it ($4,000K!). See if your firm has it, or if there is a stunt version (at a university you have access to)/ trial version that you can get your hands on. I don't think that it makes sense for you to spend money on this, but you should try argus if you have access to it.
http://www.argussoftware.com/
With two levels of CFA behind you, you should be fine. I would recommend trying to get into acquisitions/finance/development, etc as soon as possible. The market for these kind of jobs should be pretty good right now and if you have the RE background and finance knowldege all you really need is to start doing it. Also, don't restrict yourself to multifamily (unless you have a reason) and keep your options open.
The Geltner and Miller book that I mentioned will help you apply your CFA knowledge to real estate. It isn't a book that will teach you a specific sector, but it will give you a view of real estate from a finance perspective (the book discusses mortgages and debt instruments, equity investment, wacc, capm, REITs, capital markets, from the perspective of real estate etc...). It will give you an good idea of the analytics of valueing real estate (which you also have from your CFA studies - real estate is just another asset with cash flows).
Try to build some simple models in excel using accounts similar to the properties that you are managing, i.e. start with an income statement and balance sheet and try to build a model to forecast cash flows and then discount it back. Then, maybe try to add a layer of debt and see what your equity returns are like. This is one way which these investments are valued in practice.
I hope that his helps.
imp