Bob, you must be trolling or something. That's the only explanation I can come up with for what you are writing here.
1. Show me a reason why you would need CAP rate comps to calculate a CAP rate. Explain this in detail where a CAP rate comp helps you calculate NOI/purchase price. Furthermore, where in the hell are you getting CAP rate comps from? Please tell me because I've never shared the P&Ls a seller has given me with anyone when I've completed an off market deal. Plus, who exactly is determining this. Brokers, Appraisers?? Ask two different appraisers what the Market CAP rate is in a particular market and prepare yourself for two different answers. Sometimes wildly different.
2. Vacancy loss can be calculated by analyzing the market you are in vs. your own portfolio performance (or a mentor's performance). I know my business model and I know the markets I invest in. My gut will tell me what is appropriate to write in on that based on the features of the property and I will test the market in diligence to confirm my theory.
3. CapEX is included in the CAP Rate calculation. Here's how, NOI/(Purchase Price+CapEx). You can also build in future capital reserves by including a line item called "Reserves" on the P&L. In fact, if you aren't including that line item, you are over-paying for a property because it should be removed from your return. If you've ever seen a banker model your property for financing, then you'd know this isn't a crazy concept. My banker went through his internal refi model with me in December and guess what, Reserves were in the P&L he entered data into but they weren't in the P&L I handed him. I'll be sure to tell him Bob said we're doing it wrong the next time I see him though.
4. I didn't read enough of the last post to address this one. Sorry
A post like what you've put here leads me to believe that you aren't out in the market place actively buying deals. If you require this type of data to make a move, then I'm sure you are sitting there in vapor lock all day trying to accurately use whatever it is you think a CAP rate is.
For everyone else, apologies for the post but this misinformation just rubbed me the wrong way. It's hard enough to start out in this business without having a bunch of BS thrown in the mix. Best advice I can give is that you use the evaluation method that is appropriate for the asset class. If you are in multi-family, then a CAP rate (Capitalization rate) will be used to build a picture of your "minimum deal requirements." Then you compare deals that come into your funnel against that. If you are in 1-4 family, just understand that CAP rates aren't used to determine price. You can still use them internally as part of your evaluation if you'd like, but don't base your buy or your exit on them.