(UNLESS OWNER OCCUPIED OR CAPITAL IMPROVEMENTS)If the land lord supplies heat, rent increase shall not exceed 4% otherwise don't exceed 3%.tenants 65 or older 2%new tenants increase can not exceed 5% over the last tenant's registered rentyou must provide a new tenant the previous rent amount in writing.you must apply to the city for each increase with 60 days notice, depending on the US department of housing and urban development for a unit of similar size.fines will be levied on a daily basis if in violation. 

It often depends on the definition of the zoning classifications within each city; based on the below info, I'm not sure which zoning classification a duplex would fall into.

If the apartment LLC syndication is a private offering or does not involve publicly traded securities, it may not be required to file documents with the SEC or appear in the Edgar database.Limited Reporting Requirements: Even if the syndication is subject to SEC regulations, it may have limited reporting requirements depending on the type of offering and the number of investors involved.

The answer to this depends on the local market.

Penalties:Misdemeanor of the first degree: This can result in a maximum imprisonment of one year and a fine of up to $1,000.Civil penalties: You may also face additional civil penalties depending on the specific circumstances.Permitting issues: Local permitting authorities might withhold final approval, revoke the permit, or pursue other actions against you, maybe not give you the CO. 

Also would depend on foreclosure costs and time lines.

Depending on the owner's situation and using a variety of negotiating tactics, my business partner and I have been able to get significant discounts while buying properties from those owners directly. 

I have been reading Long Distance Real Estate Investing - David Greene, and came across an interesting tidbit of information: Your first 10 (1-4, 5-10) property loans are Fanny Mae insured, after which your loan criteria become more unfavorable (variable rates, stricter credit score requirements etc.).

Most lenders can go up to 75%-80% LTV depending on experience and fico score. 

Lending - depends on if you are lending your funds or you are brokering the deal out.