@Gary WolfowiczYour tax situation will get MUCH MORE DIFFICULT.You will go from most likely being classified as a permanent resident to a non-resident alien.You will be required to continue filing tax returns with the US if you have income sourced to the US(I.E.

I had no idea how to do anything myself and learned that youtube is an incredible source.

If you delivered a clean / clear unit and the tenant has had a hand in creating a pest issue by living sloppily, leaving food out, etc. they should remediate the problem or you can leave a few traps, poison, close holes, etc. as a courtesy.If the problem is very severe, hire a professional and bill back to your tenant if they are unwilling to cooperate. 

Large multi-family deal sourced from direct mail marketing.

Short term: (1) determine investment goals (target ROI, markets, property size, capital stack); use this to dictate where and with whom we invest. (2) market research to evaluate where and what will meet investment goals (this is where my OP question about analyzing properties with rent control comes into play). (3) decide to sell or refi our 4-unit property in line with points (1) and (2). (4) analyze cost benefit of selling GP interest as capital source in line with points (1) and (2).

Is there some source material on this?

So if there is anyone in Los Angeles that’s looking for an house or apartment building I’ll be the source of contact . 

It looks like they pull data from different sources and offer some skip tracing, market analysis and CRM services.

I found that the data from the source was so-so, and going through improving it was worth the effort, at least based on the amount of correction it required.

Leonard  While I'm a business broker, let me start by saying that I would not represent your business, as I work only in Maine, New Hampshire and Vermont, so this isn't self-promotion - but I'll give you an idea of how we value a business that we're representing for sale.A business is valued based on the total cash flow to the owner from all sources.