If you convert a detached garage to an ADU you must then split part of the main dwelling or ADU to build the JADU.

So I'm looking for a way to lower my housing costs with this plan.The plan is to build an Accessory Dwelling Unit (ADU) in my basement, essentially turning my home into a duplex.

Ballotpedia has a pretty good summation of the vacancy control clause in CA Prop 21, which will be on our ballot in November:Allows rent increases in rent-controlled properties of up to 15 percent over three years at start of new tenancy (above any increase allowed by local ordinance).The actual text of the proposition reads as follows:In any jurisdiction that controls by charter provision, ordinance, or regulation the initial rental rate of a dwelling unit, if the previous tenant has voluntarily vacated, abandoned, or been evicted pursuant to paragraph (2) of Section 1161 of Code of Civil Procedure, the owner of the dwelling or unit shall be permitted to establish the initial rental rate for the vacant or abandoned dwelling or unit provided that the initial rate established pursuant to this subdivision, in combination with any increases in the rental rate during the subsequent three year period, is no greater than 15 percent more than the rental rate in effect for the immediately preceding tenancy.

I'm interested in converting a 2 car car-port to a additional dwelling unit in California.

. Ownership of a multifamily property consisting of more than four dwelling units. Joint or total ownership of a property that is held in the name of a corporation or S-corporation, even if the borrower is the ownerof the corporation and the financing is in the name of the corporation or S-corporation. Ownership in a timeshare. Ownership of a vacant (residential) lot. Ownership of a property that is held in the name of an LLC or partnership where the borrower(s) have an individual or combinedownership in the LLC or partnership of less than 25% and the financing is in the name of the LLC or partnership. Ownership of a manufactured home on a leasehold estate not titled as real property (chattel lien on the home).

I called my lender in an attempt to get a Homestyle renovation loan for the quadplex, and they informed me that they could not lend against properties containing more than one dwelling!  

Within the city limits (I think both suburban and urban tiers) you can now have, by right, up to 3 units (2 in the form of a duplex and 1 in the form of a detached accessory dwelling unit).Of course, the problem is that construction costs are so high, ADUs are difficult, but if you have a garage that could be converted easily, that could be a good way to go!

What I beleive you want to research regarding the detached carriage house is a dwelling called an "Accessory Dwelling Unit" (ADU). 

Most of the rentals are single family dwellings that rent during the high season, Jan-Feb-March the town is taken over by Canadians and Northerners escaping the cold.  

Hello Baltimore City BPers,I am an active flipper in Baltimore city and I have come across several properties (townhouses especially) with no recorded square footage in public records but their sizes are recorded as 'RENTAL DW' (Rental Dwelling) instead.For investors familiar with this term, what are the implications of a RENTAL DW townhouse for a flipper?