I've been thinking for a while in working for myself and increasing wealth instead of just money.

I'd ask him (/her/them) to appraise it as if he was being the eyes and ears of an FHA lender, because those standards are a little bit higher than fannie/freddie, and include health/safety issues.

If you aren't already do all the standard personal finance stuff, like maxing out 401k's, backdoor IRA's, HSA's, you should.  

I imagine that the length increases by some amount, but I doubt it would be a full year since many tenants feel fine riding out a month-to-month lease until they decide to leave.Do the downsides (forfeit of owner ability to increase rents after the year and potential to get stuck with a trouble tenant constantly calling for minor repairs) compensate for whatever this additional length of stay is?

Besides debt service will your expenses increase against the new gross income?

I am thinking of buying 4-10 units building using buy and hold strategy to increase my current cash flow on monthly basis .I have invested both in bay area and TX market.

Areas prone to drought and wildfire probably have increased dwelling premiums also.That being said, if this is normal in those areas, the rent should probably cover those expenses without too much trouble.  

@Abdul Azeez, I think that the problem is that you are stacking the deck against yourself trying to do all of these things on your first deal:1) Purchasing the property from an online auction site / bank, which is notoriously tricky even for the experienced investor, due to their proprietary contracts and minimal due diligence period and strict deadlines.2) Working with a new contractor that you haven't used before, or seen their work before, and who may not be used to dealing with investors.3) Trying to get conventional financing on a property that has a short closing time and where the mechanical systems cannot be tested.4) Working on your first deal by yourself instead of partnering with a local investor who can guide you along, or at least a mentor who you can turn to with questions.My advice is to make it easier on yourself by considering buying a property with a standard contract and longer due diligence period, network with local investors who can provide you contractor contacts and also some guidance, and consider using private financing or hard money instead of bank financing.In my opinion, buying from the online auction sites is a more advanced strategy that you can use once you are able to ballpark construction costs yourself and/or you have a trusted contractor you've worked with before and/or you have private financing or hard money set up so you can close fast and/or you can purchase the property without interior access and hope to get lucky in terms of condition (but still buy at a price where you are comfortable doing a full rehab if necessary without losing much money) and/or you are familiar with agreement of sale contracts and closings in your state so you can assess the risks of using the bank's seller-friendly contract.You're already doing the right things by asking questions on this forum, and taking action.  

They seem to give me the standard answers.

Less headache and liability.HOA fees tend to keep increasing over the years so need to consider that.